单选题Night-shift workers often find it difficult to sleep in the morning because _____.Atheir internal clock will not allow them toBthey are often disturbed by morning visitsCthey are not trying hard enough to do soDthey are too tired to go to sleep well
单选题
Night-shift workers often find it difficult to sleep in the morning because _____.
A
their internal clock will not allow them to
B
they are often disturbed by morning visits
C
they are not trying hard enough to do so
D
they are too tired to go to sleep well
参考解析
解析：
判断推理题。题目询问“夜班工人发现清晨难以入睡的原因是什么？”从文章倒数第三句“Night-shift workers often find it...”可知，难以入睡是因为身体的自然规律被打破，此时体内生物钟不允许睡觉。正确答案为A。
判断推理题。题目询问“夜班工人发现清晨难以入睡的原因是什么？”从文章倒数第三句“Night-shift workers often find it...”可知，难以入睡是因为身体的自然规律被打破，此时体内生物钟不允许睡觉。正确答案为A。
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AIn China，more and more middle school students are getting shorter sleeping time than be-fore． Most students sleep less than nine hours every night，because they have much homework to do. Some homework is given by their teachers，and some by their parents． Also，some students don't know how to save time .They are not careful enough while they do their homework，so it takes them a Iot of time． Some students spend too much time watching TV or playing computer games．They stay up very late． Some students have to get up early every morning on weekdays to get to school on time by bus or by bike．lt can be a long way from home to school．Schools and parents should cut down some of the homework so that our children can enjoy more than nine hours of sleep every night for their health． For children，we should make best use of our time． When we have enough time for sleeping，we will find it much better for both our study and health．( )21． What makes most students sleep less than nine hours every night?A． Watching TV．B． Playing computer games．C． Doing their homework．D． Doing housework．
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Did you sleep well last night? Maybe many people will answer No.In fact, in the world about one in three people do not have good sleep.(1) you say you do not have good sleep, it means waking early and not getting back to sleep, of ten interrupted short period of sleep, or hours or wakefulness.You (2) get tired, worried, and anxious.Your menory and ability to remember things will be affectedThen what should you do when you have the trouble? Do not worry about it too much.First, let' s see whether you can sleep yourself.The ways are as follows:First,(3)that your bedroom isn' t too cold or too hot Keep it dark aha quiet.Second, check your lifestyle.:Do not drink tea, coffee, cola or chocolate four hours before going to bed.Drink less liquid so that you can have no or fewer visits to the toiletSet your body clock well by getting up and going to bed he fixed time every day.You (4) take any day time naps.Develop a relaxing bedt ime habit.Read or listen to music.then take a warm bath.If you really can not sleep, try some bread, rice or mil.They will help you fall asleep.Go for a daily walk.Natural light helps you to put your body clock into correct habits,(5) do exercise outdoors if you can.Forget the worries of the day.Write down any worries,thoughts or uestions before you go to bed.With these written down, you will have less to think about and your sleep will become easier.(完型填空)A.Make sureB.MayC.IfD.Had betterE.So
The reason that many people find it hard to relax these days is that________．A．they are suffering from the effects of excessive stressB．they are working harder than they used toC．they are often too busy to find timeD．they have no idea what relaxation means to them
共用题干第二篇Not all sleep is the same every night.We experience some deep,quiet sleep and some active sleep,which is when dreams happen.You might think sleepwalking would happen during active sleep,but a person isn't physically active during active sleep.Sleepwalking usually happens in the first few hours of sleep in the stage called slow-wave or deep sleep.Not all sleepwalkers actually walk.Some simply sit up or stand in bed or act like they're awake when in fact,they're asleep! Most,however,do get up and move around for a few seconds or for as long as haff an hour.Sleepwalkers' eyes are open,but they don't see the same way they do when they're awake and often think they're in different rooms of the house or different places altogether. Sleepwalkers tend to go back to bed on their own and they won't remember it in the morning.Researchers estimate that about 15% of kids sleepwalk regularly. Sleepwalking may run in families（在家族中世代相传）and sometimes occurs when a person is sick, has a fever, is not getting enough sleep,or is stressed（紧张）.If sleepwalking occurs frequently,every night or so,it's a good idea for your mom or dad to take you to see your doctor. But occasional sleepwalking generally isn't something to worry about,although it may look funny or even scary（骇人的）for the people who see a sleepwalker in action.Although occasional sleepwalking isn't a big deal,it's important,of course,that the person is kept safe. Precautions（预防措施）should be taken so the person is less likely to fall down, run into something,or walk out the front door while sleepwalking.When does sleepwalking usually occur?A:During active sleep.B:During deep sleep.C:In the daytime.D:In the early morning.
Text 2 Obesity used to be regarded as a disease of afiluent societies.In a sense,of course,this is true:you cannot be obese if you cannot afford enough calories.But we now understand that the story is more complex,and that children from low-income groups are more likely to be obese than those from the highest-income groups.Our understanding of sleep deprivation has yet to see a similar evolution.Almost half the British population say they get six hours'sleep a night or less,compared with around a twelfth in 1942.Experts blame developments such as electriiication and the proliferation of entertainment,one neuroscientist went so far as to warn of a"catastrophic sleep-loss epidemic"recently.We need sleep for mental and physical recovery;for cognitive control,memory and leaming.Sleep loss is associated with everything from obesity and Alzheimer's disease to diabetes and poor mental health.Sleep evangelists（布i道者）such as Arianna Huffington portray a world of busy professionals sending emails into the early hours,teenagers watching televisions in their bedrooms and parents shopping online when they should be winding down.The solutions are obvious,even if we struggle to find the discipline to implement them:turn offyour phone and for goodness sake go to bed..The truth is that poorer people sleep worse.You cannot buy sleep itself,but you must pay for the circumstances likely to induce it.Overcrowded,noisy,cold or unsafe housing makes sleep harder.So does shift work-especially ifit is casualised and unpredictable.Poor nutrition and stress also take their toll.We worried about reaching for our smartphone at night,while those making the devices sleep on hard beds in shared dormitories with coworkers clattering to and fro,as Benjamin Reiss observes in his book Wild Nights."Social inequities are reproduced and even multiplied in sleep,"he writes;children in bad housing will struggle to concentrate in class after a poor night's sleep.The gap is racial too.Lauren Hale,an expert on social patrerns of sleep,notes that fewer black people get the recommended amount of sleep than any other ethnic group in the U.S.,and less of it is the most restorative kind.Racism may itself affect sleep,perhaps because of the stress it causes;African Americans who report discrimination are more likely to say they sleep poorly than those who do not.Sleep is a social justice issue,requiring social solutions.Telling people to cut down on coffee is easy;improving labour laws is harder.But when people's sleep problems reflect their lack of control over their lives,telling them they should change how they live is profoundly unhelpful.26.We can infer from Paragraph I that obesityA.is a common social problem.B.is often found among the rich.C.is not that simple as we thought.D.is caused by over-taking of calories.
共用题干Owls and Larks1 In this article,we look at the importance of sleep for learning. Most healthy adults need eight or more hours of sleep. But why do we need sleep in the first place?We need sleep for the brain to get a chance to rebuild memories stored during the day and associate these with previously learned things. If this process is interrupted by,say,the sound of an alarm clock,it may not be as effective. So if your sleep is cut short by the alarm clock,how dama- ging is it?The truth is that it's difficult to predict,as so much depends on how much sleep your body actually needs on that particular occasion.2 The popular belief that people are naturally either larks(early risers)or owls is false. The reason why people tend to be one or the other has more to do with lifestyle,age,and personality. Many people who appear to be early birds may have just become so through hab- it,for example,parents with very young children. Teenagers can have difficulty falling asleep until late at night and then they naturally have problems getting up the following morning.3 The main reason why owls are owls is that they tend to spend their time over a book, movie,or computer game till the early hours of the morning. They enjoy the quiet of the night when they can pursue their passion. On the other hand,larks can make better use of early morning hours where they can study in quiet at the time when their brains are most refreshed. So which is better for learning一an owl's or a lark's lifestyle?The simple truth is that it is more complex than simply being one or the other. Leading a well-balanced life in terms of work and play and sleeping enough to bring maximum refreshment is probably the secret.4 As for naps, experts on insomnia（失眠）argue against taking naps, as these may keep people up at night. If your nap lasts only five minutes to half an hour and does not affect your ability to fall asleep in the night,it will probably help you be more alert in evening hours.However,if you are having problems getting to sleep at night,it's not only naps that you should avoid. Try not to drink a lot of alcohol, take nicotine（尼古丁) , do mentally intense activities like preparing for exams or doing exercise in the evening. Some people swear that drinking coffee never stops them from sleeping like a log,whereas others will never go near the stuff for fear of being awake all night. However,the best advice for most is to avoid it in the evening,and if you drink coffee before a nap,remember you are likely to awaken as soon as the caffeine starts kicking in.Sleep helps brain to______.A: sleep enough to bring most refreshmentB: keep away from coffee in the eveningC: stay up till the early hours of the morningD: get up quite earlyE: store memories in the brainF: rebuild memories stored during the day
共用题干Owls and Larks1 In this article,we look at the importance of sleep for learning. Most healthy adults need eight or more hours of sleep. But why do we need sleep in the first place?We need sleep for the brain to get a chance to rebuild memories stored during the day and associate these with previously learned things. If this process is interrupted by,say,the sound of an alarm clock,it may not be as effective. So if your sleep is cut short by the alarm clock,how dama- ging is it?The truth is that it's difficult to predict,as so much depends on how much sleep your body actually needs on that particular occasion.2 The popular belief that people are naturally either larks(early risers)or owls is false. The reason why people tend to be one or the other has more to do with lifestyle,age,and personality. Many people who appear to be early birds may have just become so through hab- it,for example,parents with very young children. Teenagers can have difficulty falling asleep until late at night and then they naturally have problems getting up the following morning.3 The main reason why owls are owls is that they tend to spend their time over a book, movie,or computer game till the early hours of the morning. They enjoy the quiet of the night when they can pursue their passion. On the other hand,larks can make better use of early morning hours where they can study in quiet at the time when their brains are most refreshed. So which is better for learning一an owl's or a lark's lifestyle?The simple truth is that it is more complex than simply being one or the other. Leading a well-balanced life in terms of work and play and sleeping enough to bring maximum refreshment is probably the secret.4 As for naps, experts on insomnia（失眠）argue against taking naps, as these may keep people up at night. If your nap lasts only five minutes to half an hour and does not affect your ability to fall asleep in the night,it will probably help you be more alert in evening hours.However,if you are having problems getting to sleep at night,it's not only naps that you should avoid. Try not to drink a lot of alcohol, take nicotine（尼古丁) , do mentally intense activities like preparing for exams or doing exercise in the evening. Some people swear that drinking coffee never stops them from sleeping like a log,whereas others will never go near the stuff for fear of being awake all night. However,the best advice for most is to avoid it in the evening,and if you drink coffee before a nap,remember you are likely to awaken as soon as the caffeine starts kicking in.It is good advice for most people to______.A: sleep enough to bring most refreshmentB: keep away from coffee in the eveningC: stay up till the early hours of the morningD: get up quite earlyE: store memories in the brainF: rebuild memories stored during the day
Text 4 When you go to bed,is it because you're tured or because you need to get up at a certain time and want to make sure you get enough sleep?Everyone has a chronotype,which is the sleep cycle that their body would naturally prefer,if left to its own devices.But society forces its own chronotype on people,too.Maybe your prefer to sleep from 2 a.m.t0 10 a.m.But if you have a typical 9-to-5 workday,to get eight hours,you'd probably need to sleep from something like 11 p.m.t0 7 a,m.Individuals'sleep is surely shaped by their jobs,their families,and their habits.But a new study shows that society can shape sleep broadly,on a population level,as well.In the paper,published in Science Advances,Olivia Walch,Amy Cochran,and Daniel Forger of the University of Michigan look at data gathered from a smartphone app to see how sleep cycles vary in different countries and among different demographics.What country people lived in didn't have any noticeable effect on when they woke up,but it was linked to what time they went to bed.And what time they went to bed was linked to how much sleep they got.So in the countries that got less sleep on average,like Japan and Brazil,it was because they were going to bed later,not because they were waking up earlier than people in countries that got more sleep on average,like the Netherlands and Belgium,where people have earlier bedtimes.But it's notable in pointing out bedtime as a problem area.A lot of the research and discussion about the tension between sleep and society has focused on the morning-how the 9-to-5 workday isn't suitable for everyone's internal clocks,how starting the school day later can help teens,who have notoriously late chronotypes,how exposing yourself to light in the moming can help keep your intemal clock wound in a way that promotes good sleep.Bedtime,meanwhile,seems like it should be more of a choice.You wake up to go somewhere,or to start fulfilling responsibilities,and you go to bed when you decide to,based on a complex calculus of how tired you are,how much sleep you want to get,and whether the chapter you were just reading in your book ended on a cliffhanger.But when people are deciding to go to bed differs significantly across societies,it seems there's something cultural at play here,too.The factors affecting people's sleep time do not include____A.the social environment they live inB.their individual habitC.the assignment they would do with friendsD.the dramatic books they are immersed in
Text 4 When you go to bed,is it because you're tured or because you need to get up at a certain time and want to make sure you get enough sleep?Everyone has a chronotype,which is the sleep cycle that their body would naturally prefer,if left to its own devices.But society forces its own chronotype on people,too.Maybe your prefer to sleep from 2 a.m.t0 10 a.m.But if you have a typical 9-to-5 workday,to get eight hours,you'd probably need to sleep from something like 11 p.m.t0 7 a,m.Individuals'sleep is surely shaped by their jobs,their families,and their habits.But a new study shows that society can shape sleep broadly,on a population level,as well.In the paper,published in Science Advances,Olivia Walch,Amy Cochran,and Daniel Forger of the University of Michigan look at data gathered from a smartphone app to see how sleep cycles vary in different countries and among different demographics.What country people lived in didn't have any noticeable effect on when they woke up,but it was linked to what time they went to bed.And what time they went to bed was linked to how much sleep they got.So in the countries that got less sleep on average,like Japan and Brazil,it was because they were going to bed later,not because they were waking up earlier than people in countries that got more sleep on average,like the Netherlands and Belgium,where people have earlier bedtimes.But it's notable in pointing out bedtime as a problem area.A lot of the research and discussion about the tension between sleep and society has focused on the morning-how the 9-to-5 workday isn't suitable for everyone's internal clocks,how starting the school day later can help teens,who have notoriously late chronotypes,how exposing yourself to light in the moming can help keep your intemal clock wound in a way that promotes good sleep.Bedtime,meanwhile,seems like it should be more of a choice.You wake up to go somewhere,or to start fulfilling responsibilities,and you go to bed when you decide to,based on a complex calculus of how tired you are,how much sleep you want to get,and whether the chapter you were just reading in your book ended on a cliffhanger.But when people are deciding to go to bed differs significantly across societies,it seems there's something cultural at play here,too.From the discussion about moming,we can infer that____A.9-to-5 workday is not welcomed by most peopleB.most teenagers wake up too late to schoolC.what is the best time to get up is still uncertainD.school children are notorious for going to bed too late
Text 4 When you go to bed,is it because you're tured or because you need to get up at a certain time and want to make sure you get enough sleep?Everyone has a chronotype,which is the sleep cycle that their body would naturally prefer,if left to its own devices.But society forces its own chronotype on people,too.Maybe your prefer to sleep from 2 a.m.t0 10 a.m.But if you have a typical 9-to-5 workday,to get eight hours,you'd probably need to sleep from something like 11 p.m.t0 7 a,m.Individuals'sleep is surely shaped by their jobs,their families,and their habits.But a new study shows that society can shape sleep broadly,on a population level,as well.In the paper,published in Science Advances,Olivia Walch,Amy Cochran,and Daniel Forger of the University of Michigan look at data gathered from a smartphone app to see how sleep cycles vary in different countries and among different demographics.What country people lived in didn't have any noticeable effect on when they woke up,but it was linked to what time they went to bed.And what time they went to bed was linked to how much sleep they got.So in the countries that got less sleep on average,like Japan and Brazil,it was because they were going to bed later,not because they were waking up earlier than people in countries that got more sleep on average,like the Netherlands and Belgium,where people have earlier bedtimes.But it's notable in pointing out bedtime as a problem area.A lot of the research and discussion about the tension between sleep and society has focused on the morning-how the 9-to-5 workday isn't suitable for everyone's internal clocks,how starting the school day later can help teens,who have notoriously late chronotypes,how exposing yourself to light in the moming can help keep your intemal clock wound in a way that promotes good sleep.Bedtime,meanwhile,seems like it should be more of a choice.You wake up to go somewhere,or to start fulfilling responsibilities,and you go to bed when you decide to,based on a complex calculus of how tired you are,how much sleep you want to get,and whether the chapter you were just reading in your book ended on a cliffhanger.But when people are deciding to go to bed differs significantly across societies,it seems there's something cultural at play here,too.The paper published by the professors from University ofMichigan shows that____A.many people use smartphones before going to sleepB.the countries where people live may decide when they get upC.Japanese go to bed later and wake up laterD.people in some European countries enjoy longer sleep time
Text 4 When you go to bed,is it because you're tured or because you need to get up at a certain time and want to make sure you get enough sleep?Everyone has a chronotype,which is the sleep cycle that their body would naturally prefer,if left to its own devices.But society forces its own chronotype on people,too.Maybe your prefer to sleep from 2 a.m.t0 10 a.m.But if you have a typical 9-to-5 workday,to get eight hours,you'd probably need to sleep from something like 11 p.m.t0 7 a,m.Individuals'sleep is surely shaped by their jobs,their families,and their habits.But a new study shows that society can shape sleep broadly,on a population level,as well.In the paper,published in Science Advances,Olivia Walch,Amy Cochran,and Daniel Forger of the University of Michigan look at data gathered from a smartphone app to see how sleep cycles vary in different countries and among different demographics.What country people lived in didn't have any noticeable effect on when they woke up,but it was linked to what time they went to bed.And what time they went to bed was linked to how much sleep they got.So in the countries that got less sleep on average,like Japan and Brazil,it was because they were going to bed later,not because they were waking up earlier than people in countries that got more sleep on average,like the Netherlands and Belgium,where people have earlier bedtimes.But it's notable in pointing out bedtime as a problem area.A lot of the research and discussion about the tension between sleep and society has focused on the morning-how the 9-to-5 workday isn't suitable for everyone's internal clocks,how starting the school day later can help teens,who have notoriously late chronotypes,how exposing yourself to light in the moming can help keep your intemal clock wound in a way that promotes good sleep.Bedtime,meanwhile,seems like it should be more of a choice.You wake up to go somewhere,or to start fulfilling responsibilities,and you go to bed when you decide to,based on a complex calculus of how tired you are,how much sleep you want to get,and whether the chapter you were just reading in your book ended on a cliffhanger.But when people are deciding to go to bed differs significantly across societies,it seems there's something cultural at play here,too.The word"chronotype"（Para.2）is closest in meaning to_____A.the sleep cycle that body would naturally preferB.the time people would like to wake upC.the bedtime people choose for themselvesD.how long people sleep everyday
Text 4 When you go to bed,is it because you're tured or because you need to get up at a certain time and want to make sure you get enough sleep?Everyone has a chronotype,which is the sleep cycle that their body would naturally prefer,if left to its own devices.But society forces its own chronotype on people,too.Maybe your prefer to sleep from 2 a.m.t0 10 a.m.But if you have a typical 9-to-5 workday,to get eight hours,you'd probably need to sleep from something like 11 p.m.t0 7 a,m.Individuals'sleep is surely shaped by their jobs,their families,and their habits.But a new study shows that society can shape sleep broadly,on a population level,as well.In the paper,published in Science Advances,Olivia Walch,Amy Cochran,and Daniel Forger of the University of Michigan look at data gathered from a smartphone app to see how sleep cycles vary in different countries and among different demographics.What country people lived in didn't have any noticeable effect on when they woke up,but it was linked to what time they went to bed.And what time they went to bed was linked to how much sleep they got.So in the countries that got less sleep on average,like Japan and Brazil,it was because they were going to bed later,not because they were waking up earlier than people in countries that got more sleep on average,like the Netherlands and Belgium,where people have earlier bedtimes.But it's notable in pointing out bedtime as a problem area.A lot of the research and discussion about the tension between sleep and society has focused on the morning-how the 9-to-5 workday isn't suitable for everyone's internal clocks,how starting the school day later can help teens,who have notoriously late chronotypes,how exposing yourself to light in the moming can help keep your intemal clock wound in a way that promotes good sleep.Bedtime,meanwhile,seems like it should be more of a choice.You wake up to go somewhere,or to start fulfilling responsibilities,and you go to bed when you decide to,based on a complex calculus of how tired you are,how much sleep you want to get,and whether the chapter you were just reading in your book ended on a cliffhanger.But when people are deciding to go to bed differs significantly across societies,it seems there's something cultural at play here,too.In the following part immediately after this text,the author will most probably focus on____A.what sleep patterns people have in different countriesB.the impact of culture on people's sleepC.whether it is influential to read books before sleepD.how many choices people have on bedtime
单选题According to one resident, they are short of sleep because ______.Athey are too tired to fall asleepBthey are forbidden to sleep at workCthey are kept by treating their patientsDthey are too worried about oversleeping
问答题Practice 1 Are you a real grump (脾气坏的人) in the mornings? Do you wake up every day feeling tired, angry and upset, and all too ready to flit the snooze (瞌睡) button? If so, then a new alarm clock could be just for you. The clock, called SleepSmart, measures your sleep cycle, and waits for you to be in your lightest phase of sleep before waking you up, Its makers say that should ensure you wake up feeling refreshed (恢复精力) every morning. As you sleep you pass through a sequence of sleep states—light sleep, deep sleep and REM sleep (快速眼动睡眼)—that repeats approximately every 90 minutes. The points in that cycle at which you wake can affect how you feel later, and may even have a greater impact than how long or little you have slept. Being wakened during a light phase means you are more likely to wake up cheerful and full of life and interest. SleepSmart records the distinct pattern of brain waves produced during each phase of sleep, via a headband equipped with electrodes (电极) and a microprocessor. This measures electric activity of the wearer’s brain, and communicates wirelessly with a clock unit near the bed. You program the clock with the latest time at which you want to be wakened, and it then at the proper time wakes you during the last light sleep phase before that. The concept was invented by a group of students at Brown University in Rhode Island after a friend complained of waking up tired and performing poorly on a test. “As sleep-deprived (剥夺) people ourselves, we started thinking of what to do about it,” says Eric Shashoua, a recent college graduate and now chief executive officer of Axon Sleep Research Laboratories, a company created by the students to develop their idea. They have almost finished a prototype and plan to market the product by next year.
单选题It can be inferred from the passage in regard to television programming that the author believes _____.Athe broadcasters are trying to do the right thing but are failingBforeign countries are going to pattern their programs after oursCthe listeners do not necessarily know what is good for themDsix o’clock in the morning is too early for a television show
单选题To relax himself before sleep, the writer often _____.Amakes a bedBgets into his bagClisten to musicDwears a sleep mask
单选题According to the passage, people have difficulty getting to sleep because ______.Athey work more than sixty hours a weekBthey have too many enemiesCthey do not sleep happilyDthey are not tired enough
单选题Doctor: Morning, Mr. White. Come in. And what can I do for you today? ? ? ?Patient: Well, doctor,_____ I often wake up at 3:00 in the morning and I just can’t get back to sleep. Doctor: I see…and how long has this been going on? Patient:Oh, about a month now. I wonder if you could prescribe something.AI’m having difficulty sleeping.BI’m watching TV every night.CI’m getting too much sleep.DI’m eating too much.
单选题Night-shift workers often find it difficult to sleep in the morning because _____.Atheir internal clock will not allow them toBthey are often disturbed by morning visitsCthey are not trying hard enough to do soDthey are too tired to go to sleep well
问答题Practice 10 Like most creatures on earth, humans come equipped with a circadian clock, a roughly 24-hour internal timer that keeps our sleep patterns in sync with our planet. At least until genetics, age and our personal habits get in the way. Even though the average adult needs eight hours of sleep per night, there are “short-sleepers,” who need far less, and morning people, who, research shows, often come from families of other morning people. Then there’s the rest of us, who rely on alarm clocks. For those who fantasize about greeting the dawn, there is hope. Sleep experts say that with a little discipline (well, actually, a lot of discipline), most people can reset their circadian clocks. But it’s not as simple as forcing yourself to go to bed earlier (you can’t make a wide-awake brain sleep). It requires inducing a sort of jet lag without leaving your time zone. And sticking it out until your body clock resets itself. And then not resetting it again. To start, move up your wake-up time by 20 minutes a day. If you regularly rise at 8 a.m., but really want to get moving at 6 a.m., set the alarm for 7：40 on Monday. The next day, set it for 7：20 and so on. Then, after you wake up, don’t linger in bed. Hit yourself with light. In theory, you’ll gradually get sleepy about 20 minutes earlier each night, and you can facilitate the transition by avoiding extra light exposure from computers or televisions as you near bedtime. But recalibrating your inner clock requires more commitment than many people care to give. For some, it’s almost impossible. Very early risers and longtime night owls have a hard time ever changing. Night-shift workers also struggle because they don’t get the environmental and social cues that help adjust the circadian clock.
单选题Many doctors think it is helpful for night-shift workers _____.Ato sleep with a bright light onBto plan sleep patterns carefullyCto avoid being disturbed at workDto sleep for a long time after work
单选题Passage 1People often complained about not gettinga good night's sleep, but sleep patterns differ from person to person. Most adults require six to eight hours of sleep to function well, while others survive on only a few hours. Still, most people today think of sleep as one continuous period of downtime. This is not the way people used to sleep. According to researchers in earlier times, people divided sleep by first sleep a few hours, waking up, then going back to sleep.Before the 18th century, people had no gas or electricity in their homes. Fire, candles, or oil lamps were the common forms of lighting. This lack of artificial lighting in homes contributed to people's sleep patterns. It made sense for people to go to bed early. If you live in this time period, you might be a hard-working farmer, and you would come home, eat and quickly fall into bed exhausted. You would probably go to sleep at 9:00 or 10:00 P.M. In this first period of sleep-called first sleep-you would typically sleep until midnight or shortly afterwards.Halfway through the night during a period some call the watch, or watching period. When you came out of first sleep, you would stay in bed and relax quietly. You might talk with a bedfellow, meditate on the day's events or the meaning of a dream, or just let your mind wander. If you enjoyed writing or drawing, you might get out of bed to write a poem or story or draw a picture.Then you would start to feel sleepy, so would return to bed and fall asleep again for your second sleep. This period would continue until early morning when daylight arrived. Again, with no artificial lighting in homes, people naturally woke up early to take advantage of sunlight.Today, human may consider divided sleep a strange habit, but sleep researchers say that it is actually a more natural sleep pattern. Dr. Thomas Wehr of the U.S. National Institute of Mental Health has studied human sleep. He thinks that modern sleep problems occur because the orderly, natural way of sleep is breaking through the more recent continuous sleep pattern. Wehr and other scientists believe that artificial lighting has altered the way people sleep. In a research study, he asked 15 adults to rest and sleep in darkness for 14 hours(from 6:00 P.M. to 8:00 A.M.). At first, the subjects took a few hours to get to sleep, and then slept 11 hours a night. Then overtime, they switched to divided sleep. They fell asleep for about 3 or 5 hours in the evening, stay awake for an hour of two and the slept again for four hours till early morning.Unlike the people in the study, we modern humans generally do not practice divided sleep. However, many of us have the experience of waking up in the middle of the night. We usually consider this a sleeping problem, but perhaps we should look at it as natural behavior. Divided sleep may be the way we should all be sleeping.A first sleep followed by a relation period and a second period of sleep could help all of us to beat the stress of our fast-paced lives.What is the main idea of the text?APeople in the past did not sleep as well as people today.BPeople in the past divided their sleep into two parts.CPeople in the past woke up easily because of hard working.DPeople in the past fell asleep easily because of hard work.