共用题干第二篇Sleep DeficitJudging from recent surveys,most experts in sleep behavior agree that there is virtually an epidemic（流 行病）of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less sleep than they ought to,"says Dr. David.Even people who think they are sleeping enough would probably be better off with more rest.The beginning of our sleep-deficit (睡眠不足）crisis can be traced to the invention of the light bulb a century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scien- tists have reached the conclusion that the average person used to sleep about 9.5 hours a night."The best sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was dark."By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8 hours,and most people had to wake up to an alarm clock."People cheat on their sleep,and they don't even realize they're doing it,"says Dr. David."They think they're okay because they can get by on 6.5 hours, when they really need 7.5,eight or even more to feel ideally vigorous.Perhaps the most merciless robber of sleep,researchers say,is the complexity of the day.Whenever pressures from work,family,friends and community mount,many people consider sleep the least expensive item on his programme.In our society,you're considered dynamic if you say you only need 5.5hours' sleep.If you'ye got to get 8.5 hours,people think you lack drive and ambition.To determine the consequences of sleep deficit,researchers have put subjects through a set of psycho- logical and performance tests requiring them,for instance,to add columns of numbers or recall a passage read to them only minutes earlier."We'ye found that if you're in sleep deficit,performance suffers,"says Dr. David."Short-term memory is weakened,as are abilities to make decisions and to concentrate."The word"subjects"(Line 1,Para 4)refers to_________. A:the performance tests used in the study of sleep deficit B:special branches of knowledge that are being studied C:people whose behavior or reactions are being studied D:the psycological consequences of sleep deficit
共用题干
第二篇
Sleep Deficit
Judging from recent surveys,most experts in sleep behavior agree that there is virtually an epidemic（流
行病）of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less
sleep than they ought to,"says Dr. David.Even people who think they are sleeping enough would probably
be better off with more rest.
The beginning of our sleep-deficit (睡眠不足）crisis can be traced to the invention of the light bulb a
century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scien-
tists have reached the conclusion that the average person used to sleep about 9.5 hours a night."The best
sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was
dark."By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8
hours,and most people had to wake up to an alarm clock."People cheat on their sleep,and they don't even
realize they're doing it,"says Dr. David."They think they're okay because they can get by on 6.5 hours,
when they really need 7.5,eight or even more to feel ideally vigorous.
Perhaps the most merciless robber of sleep,researchers say,is the complexity of the day.Whenever
pressures from work,family,friends and community mount,many people consider sleep the least expensive
item on his programme.In our society,you're considered dynamic if you say you only need 5.5hours'
sleep.If you'ye got to get 8.5 hours,people think you lack drive and ambition.
To determine the consequences of sleep deficit,researchers have put subjects through a set of psycho-
logical and performance tests requiring them,for instance,to add columns of numbers or recall a passage
read to them only minutes earlier."We'ye found that if you're in sleep deficit,performance suffers,"says
Dr. David."Short-term memory is weakened,as are abilities to make decisions and to concentrate."
第二篇
Sleep Deficit
Judging from recent surveys,most experts in sleep behavior agree that there is virtually an epidemic（流
行病）of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less
sleep than they ought to,"says Dr. David.Even people who think they are sleeping enough would probably
be better off with more rest.
The beginning of our sleep-deficit (睡眠不足）crisis can be traced to the invention of the light bulb a
century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scien-
tists have reached the conclusion that the average person used to sleep about 9.5 hours a night."The best
sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was
dark."By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8
hours,and most people had to wake up to an alarm clock."People cheat on their sleep,and they don't even
realize they're doing it,"says Dr. David."They think they're okay because they can get by on 6.5 hours,
when they really need 7.5,eight or even more to feel ideally vigorous.
Perhaps the most merciless robber of sleep,researchers say,is the complexity of the day.Whenever
pressures from work,family,friends and community mount,many people consider sleep the least expensive
item on his programme.In our society,you're considered dynamic if you say you only need 5.5hours'
sleep.If you'ye got to get 8.5 hours,people think you lack drive and ambition.
To determine the consequences of sleep deficit,researchers have put subjects through a set of psycho-
logical and performance tests requiring them,for instance,to add columns of numbers or recall a passage
read to them only minutes earlier."We'ye found that if you're in sleep deficit,performance suffers,"says
Dr. David."Short-term memory is weakened,as are abilities to make decisions and to concentrate."
The word"subjects"(Line 1,Para 4)refers to_________.
A:the performance tests used in the study of sleep deficit
B:special branches of knowledge that are being studied
C:people whose behavior or reactions are being studied
D:the psycological consequences of sleep deficit
A:the performance tests used in the study of sleep deficit
B:special branches of knowledge that are being studied
C:people whose behavior or reactions are being studied
D:the psycological consequences of sleep deficit
参考解析
解析：文章第二段第一句说：睡眠不足始于一个世纪前电灯的发明。第三句说：良好的睡眠 习惯是强加于人的，晚上天黑，地里无法干活。由此可以推断出，C项符合题意。
本题为推理判断题。在文章第二段后半部分David博士直接提出：人们在睡眠问题上 自己欺骗自己，而且他们根本没有意识到这一点。由此可以推断出美国人也经常忽略睡眠不 足产生的后果。故选B。
文章第三段第二句话说：只要来自工作、家庭、朋友或社会的压力增加了，许多人就认 为睡眠不足是不重要的事情。A项；工作一忙，首先可以牺牲的是睡眠，符合题意。
本题为词义辨析题。本题考了一个熟悉的词subject。它是一个多义词，可以表示“题目”、“科目”等。但这些义项在这里都不合适。要确定它的意思，最关键的是要准确弄清它所 在句子前后部分的意思和关系。这句话前一部分说，要确定睡眠不足引起的后果：研究人员让 subject。通过一系列的心理和能力的测验，要求them将几栏数字加起来或回忆几分钟前所听 到过的文章。所以，这里subjects是人，是“正在被研究的对象”。选项C是正确答案。
本题为判断推理题。在文章最后一段研究结果“We' ye found that if you' re in sleep deficit, performance suffers,""Short-term memory is weakened,as are abilities to make decisions and to concentrate.”可知，睡眠关系到人的精力和表现。故选D。第三篇 本篇文章讲述了营养不良是造成发展中国家许多儿童体重过低，生长发育缓慢的主要原因。 世界卫生组织(WHO）呼呀国际社会关注这一现象。然而在世界范围内仍有一大批人正遭受营养不 良所带来的病痛。仅从数据方面看，铁缺乏是最普遍的微量元素缺乏症，发病人群主要是孕妇和儿 童。文章最后提到治疗铁缺乏症的一些措施。
本题为推理判断题。在文章第二段后半部分David博士直接提出：人们在睡眠问题上 自己欺骗自己，而且他们根本没有意识到这一点。由此可以推断出美国人也经常忽略睡眠不 足产生的后果。故选B。
文章第三段第二句话说：只要来自工作、家庭、朋友或社会的压力增加了，许多人就认 为睡眠不足是不重要的事情。A项；工作一忙，首先可以牺牲的是睡眠，符合题意。
本题为词义辨析题。本题考了一个熟悉的词subject。它是一个多义词，可以表示“题目”、“科目”等。但这些义项在这里都不合适。要确定它的意思，最关键的是要准确弄清它所 在句子前后部分的意思和关系。这句话前一部分说，要确定睡眠不足引起的后果：研究人员让 subject。通过一系列的心理和能力的测验，要求them将几栏数字加起来或回忆几分钟前所听 到过的文章。所以，这里subjects是人，是“正在被研究的对象”。选项C是正确答案。
本题为判断推理题。在文章最后一段研究结果“We' ye found that if you' re in sleep deficit, performance suffers,""Short-term memory is weakened,as are abilities to make decisions and to concentrate.”可知，睡眠关系到人的精力和表现。故选D。第三篇 本篇文章讲述了营养不良是造成发展中国家许多儿童体重过低，生长发育缓慢的主要原因。 世界卫生组织(WHO）呼呀国际社会关注这一现象。然而在世界范围内仍有一大批人正遭受营养不 良所带来的病痛。仅从数据方面看，铁缺乏是最普遍的微量元素缺乏症，发病人群主要是孕妇和儿 童。文章最后提到治疗铁缺乏症的一些措施。
相关考题：
共用题干Sleep DeficitJudging from recent surveys,most experts in sleep behavior agree that there is virtually an epidemic（流行病）of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less sleep than they ought to,"says Dr.David.Even people who think they are sleeping enough would probably be better off with more rest.The beginning of our sleep-deficit（睡眠不足）crisis can be traced to the invention of the light bulb a century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scientists have reached the conclusion that the average person used to sleep about 9.5 hours a night."The best sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was dark."By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8 hours,and most people had to wake up to an alarm clock."People cheat on their sleep,and they don't even realize they're doing it,"says Dr.David."They think they're okay because they can get by on 6.5 hours, when they really need 7.5,8 or even more to feel ideally vigorous."Perhaps the most merciless robber of sleep,researchers say,is the complexity of the day.Whenever pressures from work,family,friends and community mount,many people consider sleep the least expensive item on his programme.In our society,you're considered dynamic if you say you only need 5;5 hours, sleep.If you've got to get 8.5 hours,people think you lack drive and ambition.To determine the consequences of sleep deficit,researchers have put subjects through a set of psycho-logical and performance tests requiring them,for instance,to add columns of numbers or recall a passage read to them only minutes earlier."We've found that if you're in sleep deficit,performance suffers,"says Dr.David."Short-term memory is weakened,as arc abilities to make decisions and to concentrate."People in the 18th and 19th centuries used to sleep about 9.5 hours a night because they had______.A:no drive and ambition B:the best sleep habitsC:no electric light D:nothing to do in the evening
共用题干Sleep DeficitJudging from recent surveys,most experts in sleep behavior agree that there is virtually an epidemic（流行病）of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less sleep than they ought to,"says Dr.David.Even people who think they are sleeping enough would probably be better off with more rest.The beginning of our sleep-deficit（睡眠不足）crisis can be traced to the invention of the light bulb a century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scientists have reached the conclusion that the average person used to sleep about 9.5 hours a night."The best sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was dark."By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8 hours,and most people had to wake up to an alarm clock."People cheat on their sleep,and they don't even realize they're doing it,"says Dr.David."They think they're okay because they can get by on 6.5 hours, when they really need 7.5,8 or even more to feel ideally vigorous."Perhaps the most merciless robber of sleep,researchers say,is the complexity of the day.Whenever pressures from work,family,friends and community mount,many people consider sleep the least expensive item on his programme.In our society,you're considered dynamic if you say you only need 5;5 hours, sleep.If you've got to get 8.5 hours,people think you lack drive and ambition.To determine the consequences of sleep deficit,researchers have put subjects through a set of psycho-logical and performance tests requiring them,for instance,to add columns of numbers or recall a passage read to them only minutes earlier."We've found that if you're in sleep deficit,performance suffers,"says Dr.David."Short-term memory is weakened,as arc abilities to make decisions and to concentrate."The word"subjects"(Line 1,Para 4)refers to______.A:the performance tests used in the study of sleep deficitB:special branches of knowledge that are being studiedC:people whose behavior or reactions are being studiedD:the psychological consequences of sleep deficit
共用题干第二篇Sleep DeficitJudging from recent surveys,most experts in sleep behavior agree that there is virtually an epidemic（流 行病）of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less sleep than they ought to,"says Dr. David.Even people who think they are sleeping enough would probably be better off with more rest.The beginning of our sleep-deficit (睡眠不足）crisis can be traced to the invention of the light bulb a century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scien- tists have reached the conclusion that the average person used to sleep about 9.5 hours a night."The best sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was dark."By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8 hours,and most people had to wake up to an alarm clock."People cheat on their sleep,and they don't even realize they're doing it,"says Dr. David."They think they're okay because they can get by on 6.5 hours, when they really need 7.5,eight or even more to feel ideally vigorous.Perhaps the most merciless robber of sleep,researchers say,is the complexity of the day.Whenever pressures from work,family,friends and community mount,many people consider sleep the least expensive item on his programme.In our society,you're considered dynamic if you say you only need 5.5hours' sleep.If you'ye got to get 8.5 hours,people think you lack drive and ambition.To determine the consequences of sleep deficit,researchers have put subjects through a set of psycho- logical and performance tests requiring them,for instance,to add columns of numbers or recall a passage read to them only minutes earlier."We'ye found that if you're in sleep deficit,performance suffers,"says Dr. David."Short-term memory is weakened,as are abilities to make decisions and to concentrate."Many Americans believe that________.A:sleep is the first thing that can be sacrificed when one is busyB:they need more sleep to cope with the complexities of everyday lifeC:to sleep is something one can do at any time of the dayD:enough sleep promotes people's drives and ambition
共用题干第二篇Sleep DeficitJudging from recent surveys,most experts in sleep behavior agree that there is virtually an epidemic（流 行病）of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less sleep than they ought to,"says Dr. David.Even people who think they are sleeping enough would probably be better off with more rest.The beginning of our sleep-deficit (睡眠不足）crisis can be traced to the invention of the light bulb a century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scien- tists have reached the conclusion that the average person used to sleep about 9.5 hours a night."The best sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was dark."By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8 hours,and most people had to wake up to an alarm clock."People cheat on their sleep,and they don't even realize they're doing it,"says Dr. David."They think they're okay because they can get by on 6.5 hours, when they really need 7.5,eight or even more to feel ideally vigorous.Perhaps the most merciless robber of sleep,researchers say,is the complexity of the day.Whenever pressures from work,family,friends and community mount,many people consider sleep the least expensive item on his programme.In our society,you're considered dynamic if you say you only need 5.5hours' sleep.If you'ye got to get 8.5 hours,people think you lack drive and ambition.To determine the consequences of sleep deficit,researchers have put subjects through a set of psycho- logical and performance tests requiring them,for instance,to add columns of numbers or recall a passage read to them only minutes earlier."We'ye found that if you're in sleep deficit,performance suffers,"says Dr. David."Short-term memory is weakened,as are abilities to make decisions and to concentrate."People in the 18th and 19th centuries used to sleep about 9.5 hours a night because they had_______.A:no drive and ambition B:the best sleep habitsC:no electric lightD:nothing to do in the evening
共用题干第二篇Sleep DeficitJudging from recent surveys,most experts in sleep behavior agree that there is virtually an epidemic（流 行病）of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less sleep than they ought to,"says Dr. David.Even people who think they are sleeping enough would probably be better off with more rest.The beginning of our sleep-deficit (睡眠不足）crisis can be traced to the invention of the light bulb a century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scien- tists have reached the conclusion that the average person used to sleep about 9.5 hours a night."The best sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was dark."By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8 hours,and most people had to wake up to an alarm clock."People cheat on their sleep,and they don't even realize they're doing it,"says Dr. David."They think they're okay because they can get by on 6.5 hours, when they really need 7.5,eight or even more to feel ideally vigorous.Perhaps the most merciless robber of sleep,researchers say,is the complexity of the day.Whenever pressures from work,family,friends and community mount,many people consider sleep the least expensive item on his programme.In our society,you're considered dynamic if you say you only need 5.5hours' sleep.If you'ye got to get 8.5 hours,people think you lack drive and ambition.To determine the consequences of sleep deficit,researchers have put subjects through a set of psycho- logical and performance tests requiring them,for instance,to add columns of numbers or recall a passage read to them only minutes earlier."We'ye found that if you're in sleep deficit,performance suffers,"says Dr. David."Short-term memory is weakened,as are abilities to make decisions and to concentrate."According to Dr. David,Americans_________.A:are ideally vigorous even under the pressure of lifeB:often neglect the consequences of sleep deficitC:don't know how to relax themselves properlyD:can't get by on 6.5 hours of sleep
共用题干Sleep DeficitJudging from recent surveys,most experts in sleep behavior agree that there is virtually an epidemic（流行病）of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less sleep than they ought to,"says Dr.David.Even people who think they are sleeping enough would probably be better off with more rest.The beginning of our sleep-deficit（睡眠不足）crisis can be traced to the invention of the light bulb a century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scientists have reached the conclusion that the average person used to sleep about 9.5 hours a night."The best sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was dark."By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8 hours,and most people had to wake up to an alarm clock."People cheat on their sleep,and they don't even realize they're doing it,"says Dr.David."They think they're okay because they can get by on 6.5 hours, when they really need 7.5,8 or even more to feel ideally vigorous."Perhaps the most merciless robber of sleep,researchers say,is the complexity of the day.Whenever pressures from work,family,friends and community mount,many people consider sleep the least expensive item on his programme.In our society,you're considered dynamic if you say you only need 5;5 hours, sleep.If you've got to get 8.5 hours,people think you lack drive and ambition.To determine the consequences of sleep deficit,researchers have put subjects through a set of psycho-logical and performance tests requiring them,for instance,to add columns of numbers or recall a passage read to them only minutes earlier."We've found that if you're in sleep deficit,performance suffers,"says Dr.David."Short-term memory is weakened,as arc abilities to make decisions and to concentrate."According to Dr.David,Americans______.A:are ideally vigorous even under the pressure of lifeB:often neglect the consequences of sleep deficitC:don't know how to relax themselves properlyD:can't get by on 6.5 hours of sleep
共用题干第三篇Judging from recent surveys,most experts in sleep behavior agree that it is virtually an epidemic of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less sleep than they ought to,"says Dr. David.Even people who think they are sleeping enough would probably be better off with more rest.The beginning of our sleep-deficit crisis can be traced to the invention of the light bulb a century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scientists have reached the conclusion that the average person used to sleep about 9.5 hours a night. "The best sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was dark." By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8 hours,and most people had to wake to an alarm clock."People cheat on their sleep,and they don't even realize they're doing it,"says Dr. David."They think they're okay because they can get by on 6.5 hours,when they really need 7.5,8 or even more to feel ideally vigorous.""Perhaps the most merciless robber of sleep,"researchers say,"is the complexity of the day." Whenever pressures from work,family,friends and community mount,many people consider sleep the least expensive item on his program."In our society,you're considered dynamic if you say you only need 5.5 hours' sleep.If you've got to get 8.5 hours,people think you lack drive and ambition."To determine the consequences of sleep deficit,researchers have put subjects through a set of psychological and performance tests requiring them,for instance,to add columns of numbers or recall a page read to them only minutes earlier."We've found that if you're in sleep deficit,performance suffers,"says Dr. David."Short-term memory is weakened,as are abilities to make decision and to concentrate."According to Dr. David,Americans___________.A: are ideally vigorous even under the pressure of lifeB:often neglect the consequences of sleep deficitC:do not know how to relax themselves properlyD:can get by on 6.5 hours of sleep
共用题干第三篇Judging from recent surveys,most experts in sleep behavior agree that it is virtually an epidemic of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less sleep than they ought to,"says Dr. David.Even people who think they are sleeping enough would probably be better off with more rest.The beginning of our sleep-deficit crisis can be traced to the invention of the light bulb a century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scientists have reached the conclusion that the average person used to sleep about 9.5 hours a night. "The best sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was dark." By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8 hours,and most people had to wake to an alarm clock."People cheat on their sleep,and they don't even realize they're doing it,"says Dr. David."They think they're okay because they can get by on 6.5 hours,when they really need 7.5,8 or even more to feel ideally vigorous.""Perhaps the most merciless robber of sleep,"researchers say,"is the complexity of the day." Whenever pressures from work,family,friends and community mount,many people consider sleep the least expensive item on his program."In our society,you're considered dynamic if you say you only need 5.5 hours' sleep.If you've got to get 8.5 hours,people think you lack drive and ambition."To determine the consequences of sleep deficit,researchers have put subjects through a set of psychological and performance tests requiring them,for instance,to add columns of numbers or recall a page read to them only minutes earlier."We've found that if you're in sleep deficit,performance suffers,"says Dr. David."Short-term memory is weakened,as are abilities to make decision and to concentrate."The word"subjects"(line 1,Para.4)refers to__________.A:the performance tests used in the study of sleep deficitB:special branches of knowledge that are being studiedC:people whose behaviors or reactions are being studiedD:the psychological consequences of sleep deficit
共用题干第三篇Judging from recent surveys,most experts in sleep behavior agree that it is virtually an epidemic of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less sleep than they ought to,"says Dr. David.Even people who think they are sleeping enough would probably be better off with more rest.The beginning of our sleep-deficit crisis can be traced to the invention of the light bulb a century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scientists have reached the conclusion that the average person used to sleep about 9.5 hours a night. "The best sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was dark." By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8 hours,and most people had to wake to an alarm clock."People cheat on their sleep,and they don't even realize they're doing it,"says Dr. David."They think they're okay because they can get by on 6.5 hours,when they really need 7.5,8 or even more to feel ideally vigorous.""Perhaps the most merciless robber of sleep,"researchers say,"is the complexity of the day." Whenever pressures from work,family,friends and community mount,many people consider sleep the least expensive item on his program."In our society,you're considered dynamic if you say you only need 5.5 hours' sleep.If you've got to get 8.5 hours,people think you lack drive and ambition."To determine the consequences of sleep deficit,researchers have put subjects through a set of psychological and performance tests requiring them,for instance,to add columns of numbers or recall a page read to them only minutes earlier."We've found that if you're in sleep deficit,performance suffers,"says Dr. David."Short-term memory is weakened,as are abilities to make decision and to concentrate."People in the 18th and 19th centuries used to sleep about 9.5 hours a night because they had__________.A:no drive and ambitionB:no electric lightingC:the best sleep habitsD:a lot to do the next day
共用题干第二篇Sleep DeficitJudging from recent surveys,most experts in sleep behavior agree that there is virtually an epidemic（流 行病）of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less sleep than they ought to,"says Dr. David.Even people who think they are sleeping enough would probably be better off with more rest.The beginning of our sleep-deficit (睡眠不足）crisis can be traced to the invention of the light bulb a century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scien- tists have reached the conclusion that the average person used to sleep about 9.5 hours a night."The best sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was dark."By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8 hours,and most people had to wake up to an alarm clock."People cheat on their sleep,and they don't even realize they're doing it,"says Dr. David."They think they're okay because they can get by on 6.5 hours, when they really need 7.5,eight or even more to feel ideally vigorous.Perhaps the most merciless robber of sleep,researchers say,is the complexity of the day.Whenever pressures from work,family,friends and community mount,many people consider sleep the least expensive item on his programme.In our society,you're considered dynamic if you say you only need 5.5hours' sleep.If you'ye got to get 8.5 hours,people think you lack drive and ambition.To determine the consequences of sleep deficit,researchers have put subjects through a set of psycho- logical and performance tests requiring them,for instance,to add columns of numbers or recall a passage read to them only minutes earlier."We'ye found that if you're in sleep deficit,performance suffers,"says Dr. David."Short-term memory is weakened,as are abilities to make decisions and to concentrate."It can be infered from this passage that one should sleep as many hours as is necessary to_________.A:improve one’s memory dramaticallyB:be considered dynamic by other peopleC:maintain one’s daily scheduleD:feel energetic and perform adequately
共用题干Sleep DeficitJudging from recent surveys,most experts in sleep behavior agree that there is virtually an epidemic（流行病）of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less sleep than they ought to,"says Dr.David.Even people who think they are sleeping enough would probably be better off with more rest.The beginning of our sleep-deficit（睡眠不足）crisis can be traced to the invention of the light bulb a century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scientists have reached the conclusion that the average person used to sleep about 9.5 hours a night."The best sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was dark."By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8 hours,and most people had to wake up to an alarm clock."People cheat on their sleep,and they don't even realize they're doing it,"says Dr.David."They think they're okay because they can get by on 6.5 hours, when they really need 7.5,8 or even more to feel ideally vigorous."Perhaps the most merciless robber of sleep,researchers say,is the complexity of the day.Whenever pressures from work,family,friends and community mount,many people consider sleep the least expensive item on his programme.In our society,you're considered dynamic if you say you only need 5;5 hours, sleep.If you've got to get 8.5 hours,people think you lack drive and ambition.To determine the consequences of sleep deficit,researchers have put subjects through a set of psycho-logical and performance tests requiring them,for instance,to add columns of numbers or recall a passage read to them only minutes earlier."We've found that if you're in sleep deficit,performance suffers,"says Dr.David."Short-term memory is weakened,as arc abilities to make decisions and to concentrate."Many Americans believe that______.A:sleep is the first thing that can be sacrificed when one is busy B:they need more sleep to cope with the complexities of everyday lifeC:to sleep is something one can do at any time of the dayD:enough sleep promotes people's drives and ambition
共用题干Sleep DeficitJudging from recent surveys,most experts in sleep behavior agree that there is virtually an epidemic（流行病）of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less sleep than they ought to,"says Dr.David.Even people who think they are sleeping enough would probably be better off with more rest.The beginning of our sleep-deficit（睡眠不足）crisis can be traced to the invention of the light bulb a century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scientists have reached the conclusion that the average person used to sleep about 9.5 hours a night."The best sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was dark."By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8 hours,and most people had to wake up to an alarm clock."People cheat on their sleep,and they don't even realize they're doing it,"says Dr.David."They think they're okay because they can get by on 6.5 hours, when they really need 7.5,8 or even more to feel ideally vigorous."Perhaps the most merciless robber of sleep,researchers say,is the complexity of the day.Whenever pressures from work,family,friends and community mount,many people consider sleep the least expensive item on his programme.In our society,you're considered dynamic if you say you only need 5;5 hours, sleep.If you've got to get 8.5 hours,people think you lack drive and ambition.To determine the consequences of sleep deficit,researchers have put subjects through a set of psycho-logical and performance tests requiring them,for instance,to add columns of numbers or recall a passage read to them only minutes earlier."We've found that if you're in sleep deficit,performance suffers,"says Dr.David."Short-term memory is weakened,as arc abilities to make decisions and to concentrate."It can be inferred from this passage that one should sleep as many hours as is necessary to______.A:improve one,S memory dramaticallyB:be considered dynamic by other peopleC:maintain one's daily scheduleD:feel energetic and perform adequately
共用题干第三篇Judging from recent surveys,most experts in sleep behavior agree that it is virtually an epidemic of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less sleep than they ought to,"says Dr. David.Even people who think they are sleeping enough would probably be better off with more rest.The beginning of our sleep-deficit crisis can be traced to the invention of the light bulb a century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scientists have reached the conclusion that the average person used to sleep about 9.5 hours a night. "The best sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was dark." By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8 hours,and most people had to wake to an alarm clock."People cheat on their sleep,and they don't even realize they're doing it,"says Dr. David."They think they're okay because they can get by on 6.5 hours,when they really need 7.5,8 or even more to feel ideally vigorous.""Perhaps the most merciless robber of sleep,"researchers say,"is the complexity of the day." Whenever pressures from work,family,friends and community mount,many people consider sleep the least expensive item on his program."In our society,you're considered dynamic if you say you only need 5.5 hours' sleep.If you've got to get 8.5 hours,people think you lack drive and ambition."To determine the consequences of sleep deficit,researchers have put subjects through a set of psychological and performance tests requiring them,for instance,to add columns of numbers or recall a page read to them only minutes earlier."We've found that if you're in sleep deficit,performance suffers,"says Dr. David."Short-term memory is weakened,as are abilities to make decision and to concentrate."Many Americans believe that__________.A:sleep is the first thing that can be sacrificed when one is busyB:they need more sleep to cope with the complexities of everyday lifeC:to sleep is something one can do at any time of the dayD:enough sleep promotes people's drive and ambition
共用题干第三篇Judging from recent surveys,most experts in sleep behavior agree that it is virtually an epidemic of sleepiness in the nation."I can't think of a single study that hasn't found Americans getting less sleep than they ought to,"says Dr. David.Even people who think they are sleeping enough would probably be better off with more rest.The beginning of our sleep-deficit crisis can be traced to the invention of the light bulb a century ago.From diary entries and other personal accounts from the 18th and 19th centuries,sleep scientists have reached the conclusion that the average person used to sleep about 9.5 hours a night. "The best sleep habits once were forced on us,when we had nothing to do in the evening down on the farm,and it was dark." By the 1950s and 1960s,that sleep schedule had been reduced dramatically,to between 7.5 and 8 hours,and most people had to wake to an alarm clock."People cheat on their sleep,and they don't even realize they're doing it,"says Dr. David."They think they're okay because they can get by on 6.5 hours,when they really need 7.5,8 or even more to feel ideally vigorous.""Perhaps the most merciless robber of sleep,"researchers say,"is the complexity of the day." Whenever pressures from work,family,friends and community mount,many people consider sleep the least expensive item on his program."In our society,you're considered dynamic if you say you only need 5.5 hours' sleep.If you've got to get 8.5 hours,people think you lack drive and ambition."To determine the consequences of sleep deficit,researchers have put subjects through a set of psychological and performance tests requiring them,for instance,to add columns of numbers or recall a page read to them only minutes earlier."We've found that if you're in sleep deficit,performance suffers,"says Dr. David."Short-term memory is weakened,as are abilities to make decision and to concentrate."It can be concluded from the passage that one should sleep as many hours as is necessary to________.A:improve one's memory dramaticallyB:be considered dynamic by other peopleC:maintain one's daily scheduleD:feel energetic and perform adequately
It's no secret that most of us don't get enough sleep and suffer for it.If you're between the ages of 16 and 64,1 don't get seven to nine hours ofsleep per night,your logical 2,executive function,attention,and mood can be impaired.3,severe sleep deprivation can lead to depression,anxiety,and 4 ofparanoia（妄想症）.In the long run,sleep deprivation is a main 5 to the nsk ofdementia and Alzheimer's disease.6,one group that doesn't need to heed these warnings i.s executives.In our 7 of 35,000 leaders and interviews with 250 more,we found that the more seruor a person's 8 is,the more sleep they get.There are tw0 9 explanations for this.Either senior executives,with the help of_10 and hard-working middle managers,do less and take more time for sleep.Or senior executives have had the 11 and discipline throughout their career to get enough sleep and 12 maintain a high performance level without 13.Our conclusion is that the latter is the 14."Sleep has always been foundational for my performance,"Cees't Hart,president and CEO of Carlsberg Group,shared with us."And 15 to perform in a way that is required by my current job,I need seven hours of sleep,every night.Of course,with 16 travel and work commitments,sometimes this is 17,and when that happens,it comes with a cost.When I sleep less,I perform less."18,our data found that 68%ofnon-executive leaders get five to seven hours of sleep per night.When there are not enough hours in the day,they 19 some from the night.Many leaders stay up late to catch up on email or other tasks.According to our research,this tendency is widespread,20 gender.15选？A.eventuallyB.similarlyC.especiallyD.virtually
共用题干第二篇Sleep Necessary for MemoriesBurning the midnight oil before an exam or interview does harm to the performance according to a recent research which found that sleep is necessary for memories to betaken back into the brain.A good night's sleep within 30 hours of trying to remember a new task is a required condition of having good recall in the weeks ahead,scientists have found.The research,published in the December issue of Nature Neuroscience,showed that it was the act of sleep,rather than the simple passage of time,that was critical for long-term memory formation."We think that getting that first night's sleep starts the process of memory consolidation （巩固）,"said Robert Stickgold, a sleep researcher at Harvard Medical School who conducted the latest study."It seems that memories normally wash out of the brain unless some process nails them down.My suspicion is that sleep is one of those things that does the nailing down," Professor Stickgold said.With about one in five people claiming that they are so chronically short of sleep that it affects their daily activities,the latest work emphasizes the less well一understood side effect一serious memory impairment（损害）.Volunteers in an experiment found it easier to remember a memory task if they were allowed to sleep that night.But for those kept awake,no amount of subsequent sleep made up for the initial loss.Professor Stickgold's team trained 24 people to identify the direction of three diagonal （斜线形的）bars flashed for a sixtieth of a second on a computer screen full of horizontal （水平的）stripes.Half of the subjects were kept awake that night,while the others slept.Both groups were allowed to sleep for the second and third nights to make up for any differences intiredness between the volunteers.Those who slept the first night were significantly and consistently better at remembering the task while the second group showed no improvement despite enjoying two nights of catch-up sleep.In Stickgold's experiment,those who were kept awake on the first nightA:could very well remember the direction of the diagonal bars.B:didn't do any better after two nights' sleep.C:were as tired as those who were not.D:could recall the direction of more bars than those who were not.
共用题干第二篇Sleep Necessary for MemoriesBurning the midnight oil before an exam or interview does harm to the performance according to a recent research which found that sleep is necessary for memories to betaken back into the brain.A good night's sleep within 30 hours of trying to remember a new task is a required condition of having good recall in the weeks ahead,scientists have found.The research,published in the December issue of Nature Neuroscience,showed that it was the act of sleep,rather than the simple passage of time,that was critical for long-term memory formation."We think that getting that first night's sleep starts the process of memory consolidation （巩固）,"said Robert Stickgold, a sleep researcher at Harvard Medical School who conducted the latest study."It seems that memories normally wash out of the brain unless some process nails them down.My suspicion is that sleep is one of those things that does the nailing down," Professor Stickgold said.With about one in five people claiming that they are so chronically short of sleep that it affects their daily activities,the latest work emphasizes the less well一understood side effect一serious memory impairment（损害）.Volunteers in an experiment found it easier to remember a memory task if they were allowed to sleep that night.But for those kept awake,no amount of subsequent sleep made up for the initial loss.Professor Stickgold's team trained 24 people to identify the direction of three diagonal （斜线形的）bars flashed for a sixtieth of a second on a computer screen full of horizontal （水平的）stripes.Half of the subjects were kept awake that night,while the others slept.Both groups were allowed to sleep for the second and third nights to make up for any differences intiredness between the volunteers.Those who slept the first night were significantly and consistently better at remembering the task while the second group showed no improvement despite enjoying two nights of catch-up sleep.Those who slept the first nightA:couldn't remember the task.B:could not sleep the second and third nights.C:performed slightly better than those who did not.D:did much better than those who did not.
共用题干SleepingPeople who sleep for more than eight hours a night do not live as long as those who sleep for six hours,according to the biggest study yet into sleep patterns and mortality（死亡率）.Scientists have no explanation for the findings and do not know if they mean people who like a lie-in（睡懒觉）can extend their lives by sleeping less.Although it is a common belief that sleeping for at least eight hours a night is vital forhealth and well-being,the six-year study involving more than 1.1 million Americans older than 30 found that those who slept for less than eight hours were far from doing themselves any long-term harm."Individuals who now average 6.5 hours of sleep a night can be reassured that this is a safe amount of sleep.From a health standpoint,there is no reason to sleep longer,"said Daniel Kripke , a professor of psychiatry（精神病学）at the University of California, San Diego.Dr. Kripke said,"We don't know if long sleep periods lead to death.Additional studies are needed to determine if setting your alarm clock earlier will actually improve your health."The scientists,who were funded by the American Cancer Society,found that the best survival rates were among the men and women who slept for seven hours a night.Those who slept for eight hours were 12 per cent more likely to die during the six-year period of the study,when other factors such as diet and smoking were taken into account.Even those who spent a mere five hours a night in bed lived longer than those who slept eight or more hours.However,an increasing death rate was found among those who slept for less than five hours.Dr. Kripke said,"Previous sleep studies have indicated that both short-and long-duration （持续时间）sleep had higher mortality rates. However, none of those studies were large enough to distinguish the difference between seven and eight hours a night,until now." Most of the participants slept for 7 hours a night during the study.A:Right B:Wrong C:Not mentioned
共用题干SleepingPeople who sleep for more than eight hours a night do not live as long as those who sleep for six hours,according to the biggest study yet into sleep patterns and mortality（死亡率）.Scientists have no explanation for the findings and do not know if they mean people who like a lie-in（睡懒觉）can extend their lives by sleeping less.Although it is a common belief that sleeping for at least eight hours a night is vital forhealth and well-being,the six-year study involving more than 1.1 million Americans older than 30 found that those who slept for less than eight hours were far from doing themselves any long-term harm."Individuals who now average 6.5 hours of sleep a night can be reassured that this is a safe amount of sleep.From a health standpoint,there is no reason to sleep longer,"said Daniel Kripke , a professor of psychiatry（精神病学）at the University of California, San Diego.Dr. Kripke said,"We don't know if long sleep periods lead to death.Additional studies are needed to determine if setting your alarm clock earlier will actually improve your health."The scientists,who were funded by the American Cancer Society,found that the best survival rates were among the men and women who slept for seven hours a night.Those who slept for eight hours were 12 per cent more likely to die during the six-year period of the study,when other factors such as diet and smoking were taken into account.Even those who spent a mere five hours a night in bed lived longer than those who slept eight or more hours.However,an increasing death rate was found among those who slept for less than five hours.Dr. Kripke said,"Previous sleep studies have indicated that both short-and long-duration （持续时间）sleep had higher mortality rates. However, none of those studies were large enough to distinguish the difference between seven and eight hours a night,until now." The findings indicate that it is all right to sleep for 6.5 hours a night.A:Right B:Wrong C:Not mentioned
共用题干SleepingPeople who sleep for more than eight hours a night do not live as long as those who sleep for six hours,according to the biggest study yet into sleep patterns and mortality（死亡率）.Scientists have no explanation for the findings and do not know if they mean people who like a lie-in（睡懒觉）can extend their lives by sleeping less.Although it is a common belief that sleeping for at least eight hours a night is vital forhealth and well-being,the six-year study involving more than 1.1 million Americans older than 30 found that those who slept for less than eight hours were far from doing themselves any long-term harm."Individuals who now average 6.5 hours of sleep a night can be reassured that this is a safe amount of sleep.From a health standpoint,there is no reason to sleep longer,"said Daniel Kripke , a professor of psychiatry（精神病学）at the University of California, San Diego.Dr. Kripke said,"We don't know if long sleep periods lead to death.Additional studies are needed to determine if setting your alarm clock earlier will actually improve your health."The scientists,who were funded by the American Cancer Society,found that the best survival rates were among the men and women who slept for seven hours a night.Those who slept for eight hours were 12 per cent more likely to die during the six-year period of the study,when other factors such as diet and smoking were taken into account.Even those who spent a mere five hours a night in bed lived longer than those who slept eight or more hours.However,an increasing death rate was found among those who slept for less than five hours.Dr. Kripke said,"Previous sleep studies have indicated that both short-and long-duration （持续时间）sleep had higher mortality rates. However, none of those studies were large enough to distinguish the difference between seven and eight hours a night,until now." Sleeping for less than 5 hours each night is better than sleeping for 5 hours.A:Right B:Wrong C:Not mentioned
共用题干SleepingPeople who sleep for more than eight hours a night do not live as long as those who sleep for six hours,according to the biggest study yet into sleep patterns and mortality（死亡率）.Scientists have no explanation for the findings and do not know if they mean people who like a lie-in（睡懒觉）can extend their lives by sleeping less.Although it is a common belief that sleeping for at least eight hours a night is vital forhealth and well-being,the six-year study involving more than 1.1 million Americans older than 30 found that those who slept for less than eight hours were far from doing themselves any long-term harm."Individuals who now average 6.5 hours of sleep a night can be reassured that this is a safe amount of sleep.From a health standpoint,there is no reason to sleep longer,"said Daniel Kripke , a professor of psychiatry（精神病学）at the University of California, San Diego.Dr. Kripke said,"We don't know if long sleep periods lead to death.Additional studies are needed to determine if setting your alarm clock earlier will actually improve your health."The scientists,who were funded by the American Cancer Society,found that the best survival rates were among the men and women who slept for seven hours a night.Those who slept for eight hours were 12 per cent more likely to die during the six-year period of the study,when other factors such as diet and smoking were taken into account.Even those who spent a mere five hours a night in bed lived longer than those who slept eight or more hours.However,an increasing death rate was found among those who slept for less than five hours.Dr. Kripke said,"Previous sleep studies have indicated that both short-and long-duration （持续时间）sleep had higher mortality rates. However, none of those studies were large enough to distinguish the difference between seven and eight hours a night,until now." The study shows that the longer you sleep each night,the longer you'll live.A:Right B:Wrong C:Not mentioned
共用题干SleepingPeople who sleep for more than eight hours a night do not live as long as those who sleep for six hours,according to the biggest study yet into sleep patterns and mortality（死亡率）.Scientists have no explanation for the findings and do not know if they mean people who like a lie-in（睡懒觉）can extend their lives by sleeping less.Although it is a common belief that sleeping for at least eight hours a night is vital forhealth and well-being,the six-year study involving more than 1.1 million Americans older than 30 found that those who slept for less than eight hours were far from doing themselves any long-term harm."Individuals who now average 6.5 hours of sleep a night can be reassured that this is a safe amount of sleep.From a health standpoint,there is no reason to sleep longer,"said Daniel Kripke , a professor of psychiatry（精神病学）at the University of California, San Diego.Dr. Kripke said,"We don't know if long sleep periods lead to death.Additional studies are needed to determine if setting your alarm clock earlier will actually improve your health."The scientists,who were funded by the American Cancer Society,found that the best survival rates were among the men and women who slept for seven hours a night.Those who slept for eight hours were 12 per cent more likely to die during the six-year period of the study,when other factors such as diet and smoking were taken into account.Even those who spent a mere five hours a night in bed lived longer than those who slept eight or more hours.However,an increasing death rate was found among those who slept for less than five hours.Dr. Kripke said,"Previous sleep studies have indicated that both short-and long-duration （持续时间）sleep had higher mortality rates. However, none of those studies were large enough to distinguish the difference between seven and eight hours a night,until now." More than one million Americans participated in the six-year study.A:Right B:Wrong C:Not mentioned
共用题干SleepingPeople who sleep for more than eight hours a night do not live as long as those who sleep for six hours,according to the biggest study yet into sleep patterns and mortality（死亡率）.Scientists have no explanation for the findings and do not know if they mean people who like a lie-in（睡懒觉）can extend their lives by sleeping less.Although it is a common belief that sleeping for at least eight hours a night is vital forhealth and well-being,the six-year study involving more than 1.1 million Americans older than 30 found that those who slept for less than eight hours were far from doing themselves any long-term harm."Individuals who now average 6.5 hours of sleep a night can be reassured that this is a safe amount of sleep.From a health standpoint,there is no reason to sleep longer,"said Daniel Kripke , a professor of psychiatry（精神病学）at the University of California, San Diego.Dr. Kripke said,"We don't know if long sleep periods lead to death.Additional studies are needed to determine if setting your alarm clock earlier will actually improve your health."The scientists,who were funded by the American Cancer Society,found that the best survival rates were among the men and women who slept for seven hours a night.Those who slept for eight hours were 12 per cent more likely to die during the six-year period of the study,when other factors such as diet and smoking were taken into account.Even those who spent a mere five hours a night in bed lived longer than those who slept eight or more hours.However,an increasing death rate was found among those who slept for less than five hours.Dr. Kripke said,"Previous sleep studies have indicated that both short-and long-duration （持续时间）sleep had higher mortality rates. However, none of those studies were large enough to distinguish the difference between seven and eight hours a night,until now." All the participants were from the state of California.A:Right B:Wrong C:Not mentioned
共用题干第一篇Sleep Necessary for MemoriesBurning the midnight oil before an exam or interview does harm to the performance according to a recent research which found that sleep is necessary for memories to be taken back into the brain.A good night's sleep within 30 hours of trying to remember a new task is a required condition of having good recall in the weeks ahead,scientists have found.The research,published in the December issue of Nature Neuroscience,showed that it was the act of sleep,rather than the simple passage of time,that was critical for long-term memory formation."We think that getting that first night's sleep starts the process of memory consolidation （巩固）."said Robert Stickgold, a sleep researcher at Harvard Medical School who conducted the latest study."It seems that memories normally wash out of the brain unless some process nails them down.My suspicion is that sleep is one of those things that does the nailing down." Professor Stickgold said.With about one in five people claiming that they are so chronically short of sleep that it affects their daily activities,the latest work emphasizes the less well-understood side effect-serious memory impairment（损害）.Volunteers in an experiment found it easier to remember a memory task if they were allowed to sleep that night.But for those kept awake,no amount of subsequent sleep made up for the initial loss.Professor Stickgold's team trained 24 people to identify the direction of three diagonal （斜线形的）bars flashed for a sixtieth of a second on a computer screen full of horizontal （水平的）stripes.Half of the subjects were kept awake that night,while the others slept.Both groups were allowed to sleep for the second and third nights to make up for any differences in tiredness between the volunteers.Those who slept the first night were significantly and consistently better at remembering the task while the second group showed no improvement despite enjoying two nights of catch-up sleep.Those who slept the first nightA:couldn't remember the task.B:could not sleep the second and third nights.C:performed slightly better than those who did not.D:did much better than those who did not.
单选题Which of the following is NOT TRUE according to the passage?AWe will be in trouble if our fat cells become less responsive to insulin.BMore and more studies are done to study the link between sleep and weight.CMore than 20％ of Americans are not getting enough sleep.DFat cells are there to help us maintain a good health.
单选题In the last paragraph the author points out that ______.Asleeping less is good for human healthBpeople ought to be persuaded to sleep less than beforeCit is incorrect to say that people sleep too littleDthose who can sleep less should be encouraged
单选题Surveys show that ______ less sleep than we think, ______ too much sleep could even harm our health.Anot only do we need, but thatBnot only we need, but alsoCnot only we need, but thatDnot only do we need, but also