单选题Food and fiber production have ______Abeen the major concern of the US government of the last 50 years.Bbeen more than doubled over the last half century.Creduced dramatically.Dbeen the main source of export for US agriculture.
单选题
Food and fiber production have ______
A
been the major concern of the US government of the last 50 years.
B
been more than doubled over the last half century.
C
reduced dramatically.
D
been the main source of export for US agriculture.
参考解析
解析：
录音首句便指出“Over the last century, the primary public need addressed by US agriculture has been food and fiber production”，可知在过去半个世纪（50年）美国农业部主要解决公众对食物和纤维产品的需求。对应选项A。
【录音原文】
Over the last century, the primary public need addressed by US agriculture has been food and fiber production. The major focus of agricultural research, in turn, has been on enhancing agricultural productivity. The success of that endeavor has been substantial, as demonstrated by major productivity gains such as the tripling of corn yields over the last 50 years.
录音首句便指出“Over the last century, the primary public need addressed by US agriculture has been food and fiber production”，可知在过去半个世纪（50年）美国农业部主要解决公众对食物和纤维产品的需求。对应选项A。
【录音原文】
Over the last century, the primary public need addressed by US agriculture has been food and fiber production. The major focus of agricultural research, in turn, has been on enhancing agricultural productivity. The success of that endeavor has been substantial, as demonstrated by major productivity gains such as the tripling of corn yields over the last 50 years.
相关考题：
By the end of last month, three English songs() . A. have taughtB. have been taughtC. has taughtD. had been taught
Millions of pounds’ worth of damage ( ) by a storm which swept across the north of England last night. A. has been causedB.have been causedC.will be causedD.will have been caused
John told us that by the end of the year they _____ together for thirty years.A. would have been livingB. would have livedC. would have been livedD. will have been living
Millions of pounds’ worth damage ______ by a storm which swept across the north of England last night. A has been causedB had been causedC will be causedD will have been caused
Had Paul received six more votes in the last election, he ________ our chairman now.[A] must have been[B] would have been[C] were[D] would be
请阅读Passage 1。完成第小题。Passage 1African elephants have been slaughtered at alarming rate over the past decade, largely because they are the primary source of the world's ivory. Their population has been dwindled from 1.3 million in 1979 to just 625,000 today, and the rate of killing has been accelerating in recent years because many of the older, bigger tusked animals have already been destroyed. "The poachers now must kill times as many elephants to get the same quantity of ivory," explained Curtis Bohlen,Senior vice president of the World Wildlife Fund.Though its record on the environment has been spotty so far, the government last week took the lead in a major conservation issue by imposing a ban on ivory imports into the US. The move came just four days after a consortium of conservation groups, including the World Wildlife Fund and Wildlife Conservation International, called for that kind of action, and it made the US the first nation to forbid imports of both raw and finished ivory. The ban, says Bohlen, sends a very clear message to the ivory poachers that the game is over.In the past African nations have resisted an ivory ban, but increasingly they realized that the decimation of the elephant herds poses a serious threat to their tourist business. Last month Tanzania and several other African countries called for an amendment to the 102 nation Convention on International Trade in Endangered Species that would make the ivory trade illegal worldwide.The amendment is expected to be approved at an October meeting in Geneva and to go into effect next January. But between now and then, conservationists contend, poachers may go on a rampage,killing elephants wholesale, so nations should unilaterally forbid imports right away. The US government brought that argument, and by week's end the twelve nations European Community had followed with its own ban.According to the passage, "dwindle" (Para.1) means__________.查看材料A．decreaseB．enlargeC．weakenD．eliminate
请阅读Passage 1。完成第小题。Passage 1African elephants have been slaughtered at alarming rate over the past decade, largely because they are the primary source of the world's ivory. Their population has been dwindled from 1.3 million in 1979 to just 625,000 today, and the rate of killing has been accelerating in recent years because many of the older, bigger tusked animals have already been destroyed. "The poachers now must kill times as many elephants to get the same quantity of ivory," explained Curtis Bohlen,Senior vice president of the World Wildlife Fund.Though its record on the environment has been spotty so far, the government last week took the lead in a major conservation issue by imposing a ban on ivory imports into the US. The move came just four days after a consortium of conservation groups, including the World Wildlife Fund and Wildlife Conservation International, called for that kind of action, and it made the US the first nation to forbid imports of both raw and finished ivory. The ban, says Bohlen, sends a very clear message to the ivory poachers that the game is over.In the past African nations have resisted an ivory ban, but increasingly they realized that the decimation of the elephant herds poses a serious threat to their tourist business. Last month Tanzania and several other African countries called for an amendment to the 102 nation Convention on International Trade in Endangered Species that would make the ivory trade illegal worldwide.The amendment is expected to be approved at an October meeting in Geneva and to go into effect next January. But between now and then, conservationists contend, poachers may go on a rampage,killing elephants wholesale, so nations should unilaterally forbid imports right away. The US government brought that argument, and by week's end the twelve nations European Community had followed with its own ban.Why did the African nations welcome an ivory ban?查看材料A．The rate of killing has been accelerating.B．The US government forbids imports of both raw and finished ivory.C．They realized that the killing of elephants is a serious threat to their tourist business.D．African people advocated an ivory ban.
What can be inferred from the last paragraph?A.Babies’ cries have long been the concerns of scientists.B.Babies start their speech acquisition at the age of three months. C.Studying babies' cries helps us understand their speech perception.D.Babies’ true speech, rather than their cries, should be the focus of study.
请阅读Passage 1。完成第小题。Passage 1African elephants have been slaughtered at alarming rate over the past decade, largely because they are the primary source of the world's ivory. Their population has been dwindled from 1.3 million in 1979 to just 625,000 today, and the rate of killing has been accelerating in recent years because many of the older, bigger tusked animals have already been destroyed. "The poachers now must kill times as many elephants to get the same quantity of ivory," explained Curtis Bohlen,Senior vice president of the World Wildlife Fund.Though its record on the environment has been spotty so far, the government last week took the lead in a major conservation issue by imposing a ban on ivory imports into the US. The move came just four days after a consortium of conservation groups, including the World Wildlife Fund and Wildlife Conservation International, called for that kind of action, and it made the US the first nation to forbid imports of both raw and finished ivory. The ban, says Bohlen, sends a very clear message to the ivory poachers that the game is over.In the past African nations have resisted an ivory ban, but increasingly they realized that the decimation of the elephant herds poses a serious threat to their tourist business. Last month Tanzania and several other African countries called for an amendment to the 102 nation Convention on International Trade in Endangered Species that would make the ivory trade illegal worldwide.The amendment is expected to be approved at an October meeting in Geneva and to go into effect next January. But between now and then, conservationists contend, poachers may go on a rampage,killing elephants wholesale, so nations should unilaterally forbid imports right away. The US government brought that argument, and by week's end the twelve nations European Community had followed with its own ban.Since many of the older, bigger-tusked animals have already been destroyed, what did the poacher do?查看材料A．They gave up poaching.B．They killed more elephants to get the same quantity of ivory..C．To them, game is over.D．They realized it was illegal to slaughter elephants.
African elephants have been slaughtered at alarming rate over the past decade, largely because they are the primary source of the world's ivory． Their population has been dwindled from 1．3 million in 1979 to just 625,000 today, and the rate of killing has been accelerating in recent years because many of the older, bigger tusked animals have already been destroyed． "The poachers now must kill times as many elephants to get the same quantity of ivory," explained Curtis Bohlen, Senior vice president of the World Wildlife Fund． Though its record on the environment has been spotty so far, the government last week took the lead in a major conservation issue by imposing a ban on ivory imports into the US． The move came just four days after a consortium of conservation groups, including the World Wildlife Fund and Wildlife Conservation International, called for that kind of action, and it made the US the first nation to forbid imports of both raw and finished ivory． The ban, says Bohlen, sends a very clear message to the ivory poachers that the game is over． In the past African nations have resisted an ivory ban, but increasingly they realized that the decimation of the elephant herds poses a serious threat to their tourist business． Last month Tanzania and several other African countries called for an amendment to the 102 nation Convention on International Trade in Endangered Species that would make the ivory trade illegal worldwide． The amendment is expected to be approved at an October meeting in Geneva and to go into effect next January． But between now and then, conservationists contend, poachers may go on a rampage, killing elephants wholesale, so nations should unilaterally forbid imports right away． The US government brought that argument, and by week's end the twelve nation European Community had followed with its own ban． What's the author's attitude?A. SubjectiveB. NeutralC. PessimisticD. Activ
根据下列内容，回答191-195题。African elephants have been slaughtered at alarming rate over the past decade, largely be-cause they are the primary source of the world's ivory. Their population has been dwindled from1.3 million in 1979 to just 625,000 today, and the rate of killing has been accelerating in recentyears because many of the older, bigger tusked animals have already been destroyed. "The poach-ers now must kill times as many elephants to get the same quantity of ivory." explained CurtisBohlen, Senior vice president of the World Wildlife Fund.Though its record on the environment has been spotty so far, the government last week tookthe lead in a major conservation issue by imposing a ban on ivory imports into the US. The movecame just four days after a consortium of conservation groups, including the World Wildlife Fundand Wildlife Conservation International, called for that kind of action, and it made the US the firstnation to forbid imports of both raw and finished ivory. The ban, says Bohlen, sends a very clearmessage to the ivory poachers that the game is over.In the past African nations have resisted an ivory ban, but increasingly they realized that thedecimation of the elephant herds poses a serious threat to their tourist business. Last month Tanza-nia and several other African countries called for an amendment to the 102 nation Convention onInternational Trade in Endangered Species that would make the ivory trade illegal worldwide. Theamendment is expected to be approved at an October meeting in Geneva and to go into effect nextJanuary. But between now and then, conservationists contend, poachers may go on a rampage,killing elephants wholesale, so nations should unilaterally forbid imports right away. The US gov-ernment brought that argument, and by week's end the twelve nation European Community hadfollowed with its own ban.Which of the following is the best title for the passage?___________A.African Elephants and the Ivory TradeB.A Bid to Save the ElephantC.The PoachersD.Elephants in Danger
Every year gray whales migrate from the Bering Sea in Alaska to the Baja Peninsula in Mexico.Eleven gray whales have died in the San Francisco Bay in the last three weeks．No one knows why the whales are dying.Last year 270 whales died along the whales'migration route．Many people think starvation is the cause．This year the dead whales seem to have more blubber(fat)on them.Twenty years ago,the gray whale was listed as an endangered species.Some scientists think that the larger number of whales makes it hard to find enough food．More whales create more pressure on the food supply,a supply that some scientists say may have dwindled as a result of the warm waters of El Nino.Most of the whales have been dead for many days before they are found and studied．This makes it hard to find the reason for death.65 whales have been seen in the San Francisco Bay Area this year compared to 17 last year．The whales could be dying from many diseases,but it may be over-population．Which of the following is NOT a possible reason for whales dying?A.PneumoniB.Brain infectioC.Over-populatioD.Over-eatin
Every year gray whales migrate from the Bering Sea in Alaska to the Baja Peninsula in Mexico.Eleven gray whales have died in the San Francisco Bay in the last three weeks．No one knows why the whales are dying.Last year 270 whales died along the whales'migration route．Many people think starvation is the cause．This year the dead whales seem to have more blubber(fat)on them.Twenty years ago,the gray whale was listed as an endangered species.Some scientists think that the larger number of whales makes it hard to find enough food．More whales create more pressure on the food supply,a supply that some scientists say may have dwindled as a result of the warm waters of El Nino.Most of the whales have been dead for many days before they are found and studied．This makes it hard to find the reason for death.65 whales have been seen in the San Francisco Bay Area this year compared to 17 last year．The whales could be dying from many diseases,but it may be over-population．About how many more whales have been sighted in the San Francisco Bay this year compared to last year?A.Twice as manB.Three times as manC.Half as manD.About the sam
共用题干Genetically Modified FoodEver since they were first put on the market in the early 1990s,genetically modified(GM，转基因）foods have been increasingly developed and marketed in many countries in the world, mainly on the basis of their promise to end the worldwide food crisis.______(46)Even if it would,is it the best solution?Despite what it promises,GM technology actually has not increased the production potential （潜力）of any crop.______(47)For instance,a report that analyses nearly two decades of research on major GM food shows that GM engineering has failed to significantly increase US crop production.______(48)While GM seeds are expensive,GM companies tell farmers that they will make good profits by saving money on pesticides（杀虫剂）.On the contrary, US government data show that GM crops in the US have produced an overall increase in pesticide use compared to traditional crops."The promise was that you could use less chemicals and boost production.But neither is true,"said Bill Christison,President of the US National Family Farm Coalition.At the same time,the authors of the book World Hunger:Twelve Myths argue that there actually is more than enough food in the world and that the hunger crisis is not caused by production. ______(49)These indeed deserve our efforts and money. Meanwhile,the rise in food prices results from the increased use of crops for fuel rather than food shortage,according to a 2008 World Bank report.______(50)Another World Bank report concluded that GM crops have little to offer to the challenges of worldwide poverty and hunger,because better ways out are available,among which "green"farming is supposed to be the first choice._______（49）A:Problems come from food distribution and politics.B:But can GM technology solve world hunger problems?C:In fact,studies show that the most widely grown GM crop has suffered reduced productivity.D:As a matter of fact,scientists see better ways to feed the world.E:Something else,however,has been on the rise.F: GM has many benefits when it was used at the beginning.
共用题干Genetically Modified FoodEver since they were first put on the market in the early 1990s,genetically modified(GM，转基因）foods have been increasingly developed and marketed in many countries in the world, mainly on the basis of their promise to end the worldwide food crisis.______(46)Even if it would,is it the best solution?Despite what it promises,GM technology actually has not increased the production potential （潜力）of any crop.______(47)For instance,a report that analyses nearly two decades of research on major GM food shows that GM engineering has failed to significantly increase US crop production.______(48)While GM seeds are expensive,GM companies tell farmers that they will make good profits by saving money on pesticides（杀虫剂）.On the contrary, US government data show that GM crops in the US have produced an overall increase in pesticide use compared to traditional crops."The promise was that you could use less chemicals and boost production.But neither is true,"said Bill Christison,President of the US National Family Farm Coalition.At the same time,the authors of the book World Hunger:Twelve Myths argue that there actually is more than enough food in the world and that the hunger crisis is not caused by production. ______(49)These indeed deserve our efforts and money. Meanwhile,the rise in food prices results from the increased use of crops for fuel rather than food shortage,according to a 2008 World Bank report.______(50)Another World Bank report concluded that GM crops have little to offer to the challenges of worldwide poverty and hunger,because better ways out are available,among which "green"farming is supposed to be the first choice._______（50）A:Problems come from food distribution and politics.B:But can GM technology solve world hunger problems?C:In fact,studies show that the most widely grown GM crop has suffered reduced productivity.D:As a matter of fact,scientists see better ways to feed the world.E:Something else,however,has been on the rise.F: GM has many benefits when it was used at the beginning.
There have been（）medicine in the last 50 years.Agreat advancesinBa great advanceinCgreat advanceonDa great advanceon
There have been（）medicine in the last 50 years.A、great advancesinB、a great advanceinC、great advanceonD、a great advanceon
The production database has been functional for the last seven days. Because of application requirements， some of the initialization parameters were changed during run time without any comments. You have been asked to find out the value of the parameters when the instance was started. Which source would you use to locate this information？（）A、fixed viewsB、the alert log fileC、the parameter fileD、the server parameter fileE、dynamic performance views
单选题I’m a nervous wreck. We applied for a mortgage loan last week, and they _____ let us know this morning if it had been approved.Awere supposed toBmight haveCwould haveDmust go to
单选题There have been（）medicine in the last 50 years.Agreat advancesinBa great advanceinCgreat advanceonDa great advanceon
单选题Over five times more studies on life satisfaction have been published since 1979 than at any time_____AformallyBagoCpreviouslyDlately
单选题Food and fiber production have ______Abeen the major concern of the US government of the last 50 years.Bbeen more than doubled over the last half century.Creduced dramatically.Dbeen the main source of export for US agriculture.
单选题Mrs. Green _____ in this university for more than 20 years when she retired from work last month.Ahas taughtBhad been teachingChas been teachingDhad been taught
单选题I’m a nervous wreck. We applied for a mortgage loan last week, and they ______ let us know this morning if it had been approved.Awere supposed to Bmight haveCwould have Dmust go to
单选题Which of the following is correct according to the passage you have just heard?AMicrosoft has been through a bruising battle with antitrust regulators.BMr. Gates’s position as the industry’s figurehead has been challenged.CThe computer industry is currently having a hard time.DMr. Gates has earned 870 billion US dollars over the last two decades.
单选题What has happened in the past half-century?AThe population of 15 countries has reduced by more than half.BMany countries have made unprecedented economic progress.CMany countries are still struggling with underdevelopment.DUrbanization has been taking place at a fast pace.
单选题The production database has been functional for the last seven days. Because of application requirements， some of the initialization parameters were changed during run time without any comments. You have been asked to find out the value of the parameters when the instance was started. Which source would you use to locate this information？（）Afixed viewsBthe alert log fileCthe parameter fileDthe server parameter fileEdynamic performance views