单选题We can safely conclude that ______.A people in the 19th century were eager to eat sugarB if shipwrecked sailors had drunk fresh water, things would have been even worseC one or more scientists have been hired to cheat in regard to sugarD scientists can
题目
单选题
We can safely conclude that ______.
A
people in the 19th century were eager to eat sugar
B
if shipwrecked sailors had drunk fresh water, things would have been even worse
C
one or more scientists have been hired to cheat in regard to sugar
D
scientists can do nothing without the money subsidized secretly
相似考题
更多“单选题We can safely conclude that ______.A people in the 19th century were eager to eat sugarB if shipwrecked sailors had drunk fresh water, things would have been even worseC one or more scientists have been hired to cheat in regard to sugarD scientists can”相关问题
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第1题：
C
“Old wives tales” are beliefs passed down from one generation to another, For Example, most of us remember our parents’ telling us to eat more of certain foods or not to do certain things. Is there any truth in these teachings? Some of them agree with present medical thinking, but others have not passed the test of time.
Did your mother ever tell you to eat your carrots because they are good for your eyes? Scientists now report that eating carrots can help prevent a serious eye disease called macular degeneration. Eating just one carrot a day can reduce the possibility of getting this disease by 40%. Garlic (蒜) is good for you, too. It can kill the type of virus that causes colds.
Unfortunately, not all of Mom’ s advice passed the test of medical studies, For example, generations of children have been told not to go swimming within an hour after eating. But research suggests that there is no danger in doing so. Do sweets cause tooth problems? Well, yes and no. Sticky sweets made with grains tend to cause more problems than sweets made with simple sugars.
Even though science can tell us that some of our traditional beliefs don’t hold water, there is still a lot of truth in the old wives’ tales. After all, much of this knowledge has been accumulated (积累) from thousands of years of experience in family health care. We should respect this body of knowledge even as we search for clear scientific support to prove it true or false.
48. Which of the following is TRUE according to the test?
A. Eating garlic is good for our eyes.
B. Sticky sweets are damaging to our teeth.
C. Swimming after a meal is dangerous.
D. Carrots prevent people from catching colds.
正确答案：D
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第2题：
Mr.Wang is the only one of the people here who ( )able to drive a truck.A、is
B、can be
C、are
D、have been
参考答案：A
-
第3题：
If we had a sample in hand, we () to negotiate business with our end-users now.
A、would be able
B、should have
C、had been able
D、should have been able
参考答案：A
-
第4题：
Text 4
The U.S. government has recently helped people learn more about the dangers of earthquakes by publishing a map. This map shows the chances of an earthquake in each part of the country. The areas of the map where government is spending a great deal of money and is working hard to help discover the answer to these two questions:
1. Can we predict earthquakes?
2. Can we control earthquakes?
To answer the first question, scientists are looking very closely at the most active fault systems in the country, such as the San Andreas fault in California. A fault is a break between two sections of the earth's surface. These breaks between sections are the places where earthquakes occur.
Scientists look at the faults for changes which might show that an earthquake was about to occur. But it will probably be many years before we can predict earthquakes accurately and the control of earthquakes is even farther away.
Nevertheless, there have been some interesting developments in the field of controlling earthquakes. The most interesting development concerns the Rocky Mountain Arsenal earthquakes. Here water was pat into a layer of rocks 4,000 metres below the surface of the ground. Shortly after this injection of water, there was a small number of earthquakes. Scientists have decided that the water which was injected into the rocks worked like oil on each other. When the water" oiled" the fault, the fault became slippery and the energy of an earthquake was released.
Scientists are still experimenting at the site of these earthquakes. They have realized that there is a connection between the injection of the water and the earthquake activity. They have suggested that it might be possible to use this knowledge to prevent very big, destructive earthquakes, that is, scientists Could inject some kind of fluid like water into faults and change one big earthquake into a number of small, harmless earthquakes.
36. Earthquake belts are ______.
A) maps that show where earthquakes are likely to occur
B) zones with a high probability of earthquakes
C) breaks between two sections of the earth's surface
D) the two layers of earth along a fault
正确答案：B
答案：B
[试题分析] 常识题。
[详细解答] 解答本题我们显然可以通过所知的地理知识就可判断，当然B为正确答案。
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第5题：
______the survivors know more of how to cope with cold water in the sinking of MV Titanic in 1912 countless lives ______.
A.Have / could have been saved
B.Have / could have saved
C.Had / could has saved
D.had / could have been saved
正确答案：D
如果那些幸存者懂得多一些在冷水中的救生方法，那么在1912年泰坦尼克号沉没事件中将会有更多的生命能幸存。 -
第6题：
共用题干
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 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 habits
C:no electric light
D:nothing to do in the evening答案：C解析：文章第二段第一句说人们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，无法在地里干活。由此可以推断出，C项符合文意。
在文章第二段倒数第二句David博士直接指出：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，许多人就认为睡眠是最不重要的事情。A项“工作一忙，首先可以牺牲的是睡眠”符合文意。
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subjects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指人，是“正在被研究的对象”。选项C是正确答案。
由文章第二段最后一句“…when they really need 7.5 , 8 or even more to feel ideally vigorous.和最后一段的研究结果“We've found that if you 're in sleep deficit , performance suffer…”可知，睡眠关系到人的精力和表现，故选D。 -
第7题：
共用题干
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 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 life
C:to sleep is something one can do at any time of the day
D:enough sleep promotes people's drives and ambition答案：A解析：文章第二段第一句说人们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，无法在地里干活。由此可以推断出，C项符合文意。
在文章第二段倒数第二句David博士直接指出：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，许多人就认为睡眠是最不重要的事情。A项“工作一忙，首先可以牺牲的是睡眠”符合文意。
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subjects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指人，是“正在被研究的对象”。选项C是正确答案。
由文章第二段最后一句“…when they really need 7.5 , 8 or even more to feel ideally vigorous.和最后一段的研究结果“We've found that if you 're in sleep deficit , performance suffer…”可知，睡眠关系到人的精力和表现，故选D。 -
第8题：
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 busy
B:they need more sleep to cope with the complexities of everyday life
C:to sleep is something one can do at any time of the day
D:enough sleep promotes people's drive and ambition答案：A解析：细节题。答案相关句在第二段第三句："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.”由此可知，以前夜晚一片漆黑，人们没有事做，因而那时的人们养成了最佳睡眠的习惯。本段首句提到了睡眠不足是因为电灯泡的发明，可推知十八九世纪的人因为没有照明，导致没有事情可做，因而养成了早睡觉的习惯。因此，选项B符合文意。选项A“没有精力和野心”和选项C “有最好的睡眠习惯”使用文中的只言片语进行干扰，不正确；选项D“第二天有很多事情要做”文中没有提及。
推断题。在第二段后半部分中，大卫博士提到其实在睡眠上人们在自欺欺人，只是他们没有意识到而已，并且人们认为睡6.5个小时他们完全可以应付。事实上，要确保精力充沛，他们需要7.5个小时、8个小时或更长时间的睡眠。在第三段中，大卫博士指出，每当面对工作、家人、朋友和社会的巨大压力时，很多人认为睡眠是最不重要的，是最可以有弹性的。由此不难得出结论，美国人不在乎睡眠不足的后果或对此视而不见，因此选项B 符合文意。
推断题。根据第三段内容可知，美国人往往通过减少睡眠时间的方式来处理生活中的事情，因为他们认为睡眠是最不重要的（the least expensive item)。因此，选项A 符合文意。选项B“需要更多的睡眠去应对生活压力”与文意正好相反；选项C“一天任何时候都可以用来睡觉”和选项D“充足的睡眠可以激发人的动力和野心”文中没有提及。
语义题。由最后一段第一句的put subjects through...tests可知，这些subjects要经过一些测试，由此推知，subjects即 “测试对象”。因此，选项C为正确答案。
推断题。由最后一段最后两句“We've found that if you're in sleep deficit, performance suffers…Short-term memory is weakened,as are abilities to make decision and to concentrate.”可知，睡眠关系到人的精力和表现，因此，选项D符合文意。虽然文章在最后一段提到了睡眠不足时，瞬时记忆力会下降，但并没有说睡多了可以提高记忆力，因此选项A“大幅度提高记忆力”不正确；选项B“被其他人认为精力充沛”是对原文的曲解；选项C“维持某人的日程安排”文中并未提及。 -
第9题：
共用题干
第三篇
The Iceman
On a September day in 1991,two Germans were climbing the mountains between Austria and Italy.High
up on a mountain pass,they found the body of a man lying on the ice.At that height(10,499 feet,or 3,200
meters),the ice is usually permanent, but 1991 had been an especially warm year. The mountain ice had
melted more than usual so the body had come to the surface.
It was lying face downward. The skeleton（骨架）was in perfect condition , except for a wound in the
head.There were still skin on the bones and the remains of some clothes.The hands were still holding the
wooden handle of an ax and on the feet there were very simple leather and cloth boots. Nearby was a pair of
gloves made of tree bark（树皮）and a holder for arrows.
Who was this man? How and when had he died? Everybody had a different answer to these ques-
tions.Some people thought that it was from this century,perhaps the body of a soldier who died in World
War I,since several soldiers had already been found in the area.A Swiss woman believed it might be her
father,who had died in those mountains twenty years before and whose body had never been found.The
scientists who rushed to look at the body thought it was probably much older,maybe even a thousand
years old.
With modern dating techniques,the scientists soon learned that the iceman was about 5,300 years
old.Born in about 3300 B.C.,he lived during the Bronze Age in Europe.At first scientists thought he was
probably a hunter who had died from an accident in the high mountains.More recent evidence,however,
tells a different story.A new kind of X-ray shows an arrowhead still stuck in his shoulder. It left only a tiny
hole in his skin,but it caused internal damage and bleeding. He certainly died from this wound,and not
from the wound on the back of his head.This means that he was probably in some kind of a battle.It might
have been part of a larger war,or he might have been fighting bandits.He might even have been a bandit
himself.
By studying his clothes and tools,scientists have already learned a great deal from the iceman about the
times he lived in.We may never know the full story of how he died,but he has given us important clues to
the history of those distant times.The word"bandits"in Paragraph 4 could be best replaced by__________.
A:soldiers
B:hunters
C:robbers
D:shooters答案：C解析：从第一段中“but 1991 had been an especially warm year.”可知，因为天气暖和，冰雪消 融，冰人才露了出来。其他几项所列原因都不是最主要的。
根据第二段的细节描写可以推测他可能是因为头上的伤而死亡的。
根据文章第三段可知，只有B项没有被提及。
本题A、B、C三项都是事实而不是推测。
通过上下文可推测该词的意思是“强盗”。 -
第10题：
共用题干
第二篇
The Iceman
On a September day in 1991,two Germans were climbing the mountains between Austria and Italy. High
up on a mountain pass,they found the body of a man lying on the ice.At that height(10,499 feet,or 3,200
meters),the ice is usually permanent,but 1991 had been an especially warm year. The mountain ice had
melted more than usual and so the body had come to the surface.
It was lying face downward. The skeleton（骨架）was in perfect condition , except for a wound in the
head.There was still skin on the bones and the remains of some clothes.The hands were still holding the
wooden handle of an ax and on the feet there were very simple leather and cloth boots.Nearby was a pair of
gloves made of tree bark（树皮）and a holder for arrows.
Who was the man?How and when had he died?Everybody had a different answer to these questions.
Some people thought that it was from this century,perhaps the body of a soldier who died in World War Ⅰ,
since several soldiers had already been found in the area.A Swiss woman believed it might be her father,who
had died in those mountains twenty years before and whose body had never been found.The scientists who
rushed to look at the body thought it was probably much older,maybe even a thousand years old.
With modem dating techniques,the. scientists soon leamed that the iceman was about 5,300 years old.
Bom in about 3300 B.C.,he lived during the Bronze Age in Europe.At first scientists thought he was proba-
bly a hunter who had died in an accident in the high mountains.More recent evidence,however,tells a differ-
ent story.A new kind of X-ray shows an arrowhead still stuck in his shoulder. It left only a tiny hole in his
skin,but it caused internal damage and bleeding. He almost certainly died from this wound,and not from the
wound on the back of his head.This means that he was probably in some kind of a battle.It might have been
part of a larger war,or he might have been fighting bandits. He might even have been a bandit himself.
By studying his clothes and tools,scientists have already leamed a great deal from the iceman about the
times he lived in.we may never know the full story of how he died,but he has given us important clues to the
history of those distant times.What can be inferred from Paragraph 2?
A:The iceman was killed while working.
B:The iceman could have died from the wound in the head.
C:The iceman lived a poor life.
D:The iceman was struck dead from behind.答案：B解析：第一段提到：1991年是特别暖的一年，山上的冰比以前消融得更多，因此尸体才显露 出来。
第二段提到：它面朝下，除了头部有伤外，骨架状况很好。仅就此推断，冰人可能死于 头部伤。
根据第三段可知，文中未提及选项B。
选项A和选项C是事实而非推论；选项B是推论；选项D不符合事实。
bandit意为“强盗”，与：obbe：意思相近。选项B意为“士兵”；选项C意为“猎人”；选项 D意为“射击手”。 -
第11题：
单选题The sentence “But this has rarely been a one-way street.” in the last paragraph means that _____.Acontemporary art has been nourished by modern science
Bmodern science has been nourished by art
Cartists can become scientists and scientists can become artists
Dthe impacts of modern art and science are actually mutual
正确答案： B解析：
此题考查的是对句意的理解。这句话的意思是“但这几乎从来就不是单行道”。联系上下文可知，这句话是说明科学与艺术之间的影响是相互的，不是单方面的。D项的mutual一词意思是“相互的”，正确表达了句意，故选D。A项和B项的说法不全面。C项意思是艺术家可以成为科学家，科学家也可以成为艺术家，理解错误。 -
第12题：
单选题Countless divorced politicians would have been elected out of office years ago had they even thought of a divorce, let alone ______ one.Agetting
Bto get
Cgotten
Dget
正确答案： C解析：
无数离婚的政治家过去如果想到离婚就会落选，更不要说真的离婚了。let alone连接两个并列的成分，本句中省略了had。 -
第13题：
Of more money had been invested,we______a factory in Asia .A.will setup
B.have set up
C.would have set up
D.had set up
答案：C
-
第14题：
The travels of Marco Polo in the twelfth century would not have been so well known ____ for the book he Wrote while in jail.A、it not have been
B、is not been
C、had it not been
D、has not been
答案：C
-
第15题：
If only it ()so cold, perhaps I, too, ()more initiative.
A、had been,have shown
B、have been,would show
C、had’t been,cound't have shown
D、had't been,could have shown
参考答案：D
-
第16题：
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
正确答案：D
-
第17题：
If it __________ for his bad cold, Rick would have enjoyed more on his birthday party.A．is not
B．were not
C．has not been
D．had not been答案：D解析：考查虚拟语气。根据句子后半句中would have enjoyed结构可知是与过去事实相反，条件从句谓语结构为“had+过去分词”。句意为“如果Rick不是因为重感冒的话。他将会在他的生日聚会上玩得更好”。故选D。 -
第18题：
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 life
B:often neglect the consequences of sleep deficit
C:do not know how to relax themselves properly
D:can get by on 6.5 hours of sleep答案：B解析：细节题。答案相关句在第二段第三句："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.”由此可知，以前夜晚一片漆黑，人们没有事做，因而那时的人们养成了最佳睡眠的习惯。本段首句提到了睡眠不足是因为电灯泡的发明，可推知十八九世纪的人因为没有照明，导致没有事情可做，因而养成了早睡觉的习惯。因此，选项B符合文意。选项A“没有精力和野心”和选项C “有最好的睡眠习惯”使用文中的只言片语进行干扰，不正确；选项D“第二天有很多事情要做”文中没有提及。
推断题。在第二段后半部分中，大卫博士提到其实在睡眠上人们在自欺欺人，只是他们没有意识到而已，并且人们认为睡6.5个小时他们完全可以应付。事实上，要确保精力充沛，他们需要7.5个小时、8个小时或更长时间的睡眠。在第三段中，大卫博士指出，每当面对工作、家人、朋友和社会的巨大压力时，很多人认为睡眠是最不重要的，是最可以有弹性的。由此不难得出结论，美国人不在乎睡眠不足的后果或对此视而不见，因此选项B 符合文意。
推断题。根据第三段内容可知，美国人往往通过减少睡眠时间的方式来处理生活中的事情，因为他们认为睡眠是最不重要的（the least expensive item)。因此，选项A 符合文意。选项B“需要更多的睡眠去应对生活压力”与文意正好相反；选项C“一天任何时候都可以用来睡觉”和选项D“充足的睡眠可以激发人的动力和野心”文中没有提及。
语义题。由最后一段第一句的put subjects through...tests可知，这些subjects要经过一些测试，由此推知，subjects即 “测试对象”。因此，选项C为正确答案。
推断题。由最后一段最后两句“We've found that if you're in sleep deficit, performance suffers…Short-term memory is weakened,as are abilities to make decision and to concentrate.”可知，睡眠关系到人的精力和表现，因此，选项D符合文意。虽然文章在最后一段提到了睡眠不足时，瞬时记忆力会下降，但并没有说睡多了可以提高记忆力，因此选项A“大幅度提高记忆力”不正确；选项B“被其他人认为精力充沛”是对原文的曲解；选项C“维持某人的日程安排”文中并未提及。 -
第19题：
共用题干
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 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 dramatically
B:be considered dynamic by other people
C:maintain one's daily schedule
D:feel energetic and perform adequately答案：D解析：文章第二段第一句说人们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，无法在地里干活。由此可以推断出，C项符合文意。
在文章第二段倒数第二句David博士直接指出：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，许多人就认为睡眠是最不重要的事情。A项“工作一忙，首先可以牺牲的是睡眠”符合文意。
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subjects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指人，是“正在被研究的对象”。选项C是正确答案。
由文章第二段最后一句“…when they really need 7.5 , 8 or even more to feel ideally vigorous.和最后一段的研究结果“We've found that if you 're in sleep deficit , performance suffer…”可知，睡眠关系到人的精力和表现，故选D。 -
第20题：
共用题干
第三篇
The Iceman
On a September day in 1991,two Germans were climbing the mountains between Austria and Italy.High
up on a mountain pass,they found the body of a man lying on the ice.At that height(10,499 feet,or 3,200
meters),the ice is usually permanent, but 1991 had been an especially warm year. The mountain ice had
melted more than usual so the body had come to the surface.
It was lying face downward. The skeleton（骨架）was in perfect condition , except for a wound in the
head.There were still skin on the bones and the remains of some clothes.The hands were still holding the
wooden handle of an ax and on the feet there were very simple leather and cloth boots. Nearby was a pair of
gloves made of tree bark（树皮）and a holder for arrows.
Who was this man? How and when had he died? Everybody had a different answer to these ques-
tions.Some people thought that it was from this century,perhaps the body of a soldier who died in World
War I,since several soldiers had already been found in the area.A Swiss woman believed it might be her
father,who had died in those mountains twenty years before and whose body had never been found.The
scientists who rushed to look at the body thought it was probably much older,maybe even a thousand
years old.
With modern dating techniques,the scientists soon learned that the iceman was about 5,300 years
old.Born in about 3300 B.C.,he lived during the Bronze Age in Europe.At first scientists thought he was
probably a hunter who had died from an accident in the high mountains.More recent evidence,however,
tells a different story.A new kind of X-ray shows an arrowhead still stuck in his shoulder. It left only a tiny
hole in his skin,but it caused internal damage and bleeding. He certainly died from this wound,and not
from the wound on the back of his head.This means that he was probably in some kind of a battle.It might
have been part of a larger war,or he might have been fighting bandits.He might even have been a bandit
himself.
By studying his clothes and tools,scientists have already learned a great deal from the iceman about the
times he lived in.We may never know the full story of how he died,but he has given us important clues to
the history of those distant times.What can be inferred from Paragraph 2?
A:The iceman was struck dead from behind.
B:The iceman could have died from the wound in the head.
C:The iceman was killed while working.
D:The iceman lived a poor life.答案：B解析：从第一段中“but 1991 had been an especially warm year.”可知，因为天气暖和，冰雪消 融，冰人才露了出来。其他几项所列原因都不是最主要的。
根据第二段的细节描写可以推测他可能是因为头上的伤而死亡的。
根据文章第三段可知，只有B项没有被提及。
本题A、B、C三项都是事实而不是推测。
通过上下文可推测该词的意思是“强盗”。 -
第21题：
共用题干
U. S. Scientists Confirm Water on Mars
NASA scientists said that Mars was covered once by vast lakes,flowing rivers and a Va-riety of other wet environments that had the potential to support life.
Laboratory tests aboard NASA's Phoenix Mars Lander have identified water in a soil sample;the lander's robotic arm delivered the sample Wednesday to an instrument that iden-tifies vapors produced by the heating of samples.
“We have water,”said William Boynton of the University of Arizona,lead scientist for ,the Thermal and Evolved-Gas Analyzer,or TEGA.“This is the first time Martian water has been touched and tasted.”
The robotic arm is a critical part of the Phoenix Mars mission. It is needed to trench into the icy layers of northern polar Mars and deliver samples to instruments that will analyze what Mars is made of,what its water is like,and whether it is or has ever been a possible habitat for life.
The soil sample came from a trench approximately 2 inches deep.When the robotic arm first reached that depth,it hit a hard layer of frozen soil.Two attempts to deliver samples of icy soil on days when fresh material was exposed were foiled when the samples became stuck inside the scoop.Most of the material in Wednesday's sample had been exposed to the air for two days,letting some of the water in the sample vaporize away and making the soil easier to handle.
“Mars is giving us some surprises,”said Phoenix principal investigator Peter Smith of the University of Arizona.“We're excited because surprises are where discoveries come from. One surprise is how the soil is behaving. The ice-rich layers stick to the scoop when poised in the sun above the deck,different from what we expected,from all the Mars simulation tes-ting we've done so far.”
Since landing on May 25,Phoenix has been studying soil with a chemistry lab,TEGA, a microscope,a conductivity probe and cameras.The science team is trying to determine whether the water ice ever thaws enough to be available for biology and if carbon-containing chemicals and other raw materials for life are present.
The mission is examining the sky as well as the ground. A Canadian instrument is using a laser beam to study dust and clouds overhead.
“It's a 30-watt light bulb giving us a laser show on Mars,”said Victoria Hipkin of the Canadian Space Agency.
A full-circle,color panorama of Phoenix's surroundings also has been completed by the spacecraft.
“The details and patterns we see in the ground show an ice-dominated terrain as far as the eye can see,”said Mark Lemmon of Texas A & M University,lead scientist for
Phoenix's Surface Stereo Imager camera.“They help us plan measurements we're making within reach of the robotic arm and interpret those measurements on a wider scale.”Which one of the following statements is NOT meant by the writer?
A: Scientists have been trying to break the ice-rich layers of soil on Mars.
B: Scientists have been surprised by how the soil on Mars behaves.
C: Scientists have been trying to find out if there is life supporting material on Mars.
D: Scientists have been trying to know if water ice will melt.答案：A解析：题干意为“美国国家航空航天局‘凤凰号’火星登陆器在火星上发现了什么？”利用题干及备选项中的细节信息词/短语NASA's Phoenix Mars Lander, vast lakes, flowing rivers,water in a soil sample,living things作为定位线索，在第一段和第二段中找到 相关句：（第一段）NASA scientists said that Mars was covered once by vast lakes, flowing rivers and a variety of other wet environments that had the potential to support life.（第二段） Laboratory tests aboard NASA's Phoenix Mars Lander have identified water in a soil sample; the lander's robotic arm delivered the sample Wednesday to an instrument that identifies va- pors produced by the heating of samples．定位线索词集中出现在第一段和第二段中，因此重 点关注这两个段落。第一段提到“美国国家航空航天局的科学家们称火星曾被巨大的湖泊，流动的河流以及其他潮湿的自然环境所覆盖，而这些都使其有了维持生命的可能”。第二段提到“在美国国家航空航天局的‘凤凰’号火星登陆器的实验室所做的实验中，已经在一份土壤样本中鉴定到水”。结合这两个句子的意思可知美国国家航空航天局“凤凰号”火星登陆器在火星上发现土壤样本中有水，因此答案为C项“土壤样本中有水”。
题干意为“为什么前两次递送样本的尝试失败了？”利用题干及备选项中的细节信息词/短语first two attempts , samples , fresh material , air , scoop , robotic arm , hard rock作为定位线索，在第五段中找到相关句；The soil sample came from a trench approxi mately 2 inches deep.When the robotic arm first reached that depth,it hit a hard layer of fro zen soil.Two attempts to deliver samples of icy soil on days when fresh material was exposed were foiled when the samples became stuck inside the scoop. Most of the material in Wednesday's sample had been exposed to the air for two days,letting some of the water in the sample vaporize away and making the soil easier to handle．定位线索词集中出现在第五段第三句中，因此首先重点关注这个句子。该句是一个复合句，句中出现了两个从句：when引导的定语从句和when引导的时间状语从句。该句意为“当新鲜的冻土暴露在空气中的时候，机器臂曾经两次尝试对冻土样本进行传送，但是样本同铲子粘在了一起，结果使得这两次尝试都以失败告终”。很明显，句中when引导的时间状语从句when the samples became stuck inside the scoop 陈述了原因。该题主要考查对复杂句子的理解。该题答案为C项“样本同铲子粘在了一起”。
题干意为“下面哪个选项不是作者想要表达的意思？”利用备选项中的细节信息词/短语scientist , ice-rich layers of soil , life supporting material , water ice 作为定位线索，在第六段和第七段中找到相关句：（第六段）“Mars is giving us some surprises,” said Phoenix principal investigator Peter Smith of the University of Arizona.“We're excited be-cause surprises are where discoveries come from. One surprise is how the soil is behaving. The ice-rich layers stick to the scoop when poised in the sun above the deck,different from what we expected, from all the Mars simulation testing we've done so far.”（第七段）Since landing on May 25,Phoenix has been studying soil with a chemistry lab,TEGA,a micro-scope,a conductivity probe and cameras. The science team is trying to determine whether the water ice ever thaws enough to be available for biology and if carbon-containing chemicals and other raw materials for life （与life supporting material呼应）are present．定位线索词在 第六段的第四句和第七段的最后一句中出现了，因此首先重点关注这两个句子。第六段第四句提到“当富冰层被悬挂于甲板上方的太阳底下的时候，它会和铲子粘在一起，这是我们从未预期到的，也不同于我们迄今为止所做过的任何火星模拟试验”。从这个句子可以得出这样的结论：科学家们从未想到过富冰层会和铲子粘在一起，这也说明科学家们对火星上土壤的表现感到吃惊，这与B项“科学家们对火星上土壤的表现感到吃惊”意义一致。第七段最后一句提到“这支科学团队尝试确定火星上的水冰是否曾经大量融化，从而能支持生物存在，同时它还将寻找火星土壤中是否有以碳为基础的有机化合物，这些化合物是形成生命的‘原材料’”。依据这个句子可知科学家们一直要想知道火星上的水冰是否融化（与选项D意义一致），同时还可以得出这样的结论：科学家们想知道火星上是否有形成生命的原材料（这与选项C一致）。A项“科学家们试图打破火星土壤的富冰层”，这是文中没有涉及到的信息，因此 A项属于“无中生有”。所以答案为A.
题干意为“参与研究的科学家们来自什么地方？”利用题干及备选项中的细节信息词scientists , research , America , Canada作为定位线索，结果发现短文的第八段和第九段提到加拿大宇航局的科学家为“凤凰号”的火星探索提供了激光设备。既然这项研究是美国国家航空航天局的科学家们做的，因此研究的参与者必然包括美国科学家，因此答案为C项 “他们来自美国和加拿大”。 -
第22题：
The water we drink and use is running short in the world.We all have to learn how to stop wasting our limited water.One of the steps we should take is to find ways of reusing it.Experiments have already been done in this field.
Today in most large cities,fresh water is used only once,then it runs into waste system.But it is possible to pipe the used water to a purifying factory.There it can be filtered and treated with chemicals so that it can be used again,just as it were fresh from a spring.
But even if every large city purified and reused its water,we still would not have enough.Then we could turn to the oceans.All we’d have to do to make use of the seawater on earth is to get rid of the salt.This process is called desalinization,and it is already in use in many parts of the world.
The way to stop wasting our limited water is to________.A.do experiments with water
B.purify the used water and reuse it
C.use fresh water once again
D.make use of seawater答案：B解析： -
第23题：
问答题The approximately 65,000 images the Surveyor orbiter has beamed home in the nearly three years it has been circling Mars are full of this kind of expected hydro-scarring. But some of the pictures took scientists by surprise. The older a formation is, the more likely it is to have been distorted over the eons--smoothed by periodic windstorms or gouged by the occasional incoming meteor. However, a few of the newly discovered water channels look flesh. That discovery has lead astonished researchers to conclude that these channels may have been recently formed. Paleontologists have long assumed that if underground water was going to bubble up on Mars, it would have to be somewhere in the balmy equatorial zones, where temperatures at noon in midsummer may reach 68 degrees Fahrenheit (20 degrees Centigrade). Almost all the new channels, however, were discovered at the planet’s relative extremes--north of 30 degrees north latitude and south of 30 degrees south latitude--and all were carved on the cold, shaded sides of slopes.正确答案：
“探测者号”飞船在环绕火星飞行的近三年时间里传回了大约65000张图片,这些图片上满是人们预想的那种水痕。但有些图片着实让科学家们吃了一惊。一种构造越是古老,就越有可能经过了亘古岁月的扭曲——或者被周期性而来的风暴抚平,或者被偶尔从天而降的流星凿成一个个深洞。然而,有几个新发现的水渠看起来像是新近形成的。这一发现导致惊愕不已的研究人员因此得出结论:这沟渠可能是最近形成的。行星研究科学家们一直认为,如果地下水是从火星的地表下冒出来的,它可能是在温暖潮湿的赤道地区,那里的气温在仲夏正午时候能高达华氏68度(摄氏20度)。然而,几乎所有这些新的沟渠都是在火星偏向两极的地方发现的——北纬30度以北,南纬30度以南——而且所有这些痕迹都刻在寒冷的山坡背阴处。解析： 暂无解析