题目内容

9.If you saw another kid ride her bike too fast around a corner and fall down,you might ride your bike more slowly on that turn.Yes,we humans are very sensitive to others'mistakes.And the same is true for other animals.Animals mess up all the time.They might eat poisonous leaves,fall off a tree or let their prey(猎物) slip away.By watching others fail,an animal can avoid making the same mistakes,thus improving its chance of survival.
Scientists suspected that one part of the brain helps animals process information about others'errors.Cells in that part appear to become more active when a person sees someone else making a mistake.But researchers didn't know whether individual cells in this part of the brain play different roles in detecting errors.
To investigate the brain's response to errors in more detail,the researchers taught a game to two macaques,a type of monkey.One monkey could press a yellow or green button while the other watched.If the first monkey pressed the right button,the team gave both animals a treat.Every couple of rounds,the two monkeys switched roles.Meanwhile,the scientists monitored individual cells in the animal's brains.
When the first monkey messed up the game by pressing the wrong button,a group of cells in the second monkey's brain fired.But if the second monkey also made the wrong choice during its turn,some of the cells in that group didn't respond.Those unresponsive cells reacted specifically to mistakes made by others,not to the monkey's own mistakes.
Scientists believe other parts of the brain also might help people process information about another's errors."You start to think about this other person and see things from his angle."Ellen de Bruijn told Science News.She studies the brain at the University of Leiden in the Netherlands.

31.According to Paragraph l,animals'ability to learn from others'mistakes.B
A.used to be ignored by humans        
B.helps them to survive better
C.is being lost because of humans        
D.ensures that they will never fail
32.The underlined word"detecting"in Paragraph 2probably means"D".
A.correcting      
B.making      
C.drawing     
D.sensing
33.From the game the scientists taught to two macaques,we can see.C
A.animals can avoid the same mistakes    
B.which part of the brain is more active
C.how the brain responds to mistakes    
D.how the brain processes information
34.In the experiment mentioned,those unresponsive cells are only sensitive toA.
A.others'mistakes            
B.the same buttons
C.one's own mistakes                
D.the monkey's brain
35.What's the main idea of the passage?A
A.Animals can learn from mistakes like human beings.
B.An interesting experiment by scientists surprised us.
C.Monkeys can avoid making mistakes by learning from us.
D.The brain cells are always sensitive to others'information.

分析 本文告诉人们我们人类对其他人的错误是非常敏感的,动物也是一样的.科学家怀疑大脑的一部分帮助动物处理关于其他动物错误的信息

解答 31.B.细节理解题.根据第一段最后一句By watching others fail,an animal can avoid making the same mistakes,thus improving its chance of survival.通过观察其他人的失败,动物能避开犯同样的错误,因此提高了它生存的可能,故选B.
32.D.词义猜测题.根据第二段第一句Scientists suspected that one part of the brain helps animals process information about others'errors.科学家怀疑大脑的一部分帮助动物处理关于其他动物错误的信息.第二段最后一句But researchers didn't know whether individual cells in this part of the brain play different roles in detecting errors.研究者不知道是否在大脑的这一部分在检测单个细胞中扮演不同的角色,故选D.
33.C.细节理解题.根据第二段提到To investigate the brain's response to errors in more detail,the researchers taught a game to two macaques,为了检查大脑对于错误的反应,研究者对了两组实验,故选C.
34.A.细节理解题.根据倒数第二段最后一句Those unresponsive cells reacted specifically to mistakes madeby others,not to the monkey's own mistakes.那些反应迟钝的细胞由别人的错误发生特异性反应,不是对猴子自己的错误.故选A.
35.A.主旨标题.本文告诉人们我们人类对其他人的错误是非常敏感的,动物也是一样的.科学家怀疑大脑的一部分帮助动物处理关于其他动物错误的信息,故选A.

点评 本篇文章主要是细节理解方面的题型,需要考生通过跳读迅速找到对应的句子进行详细理解,句子的理解可以结合上下文意思,通过逻辑推理得到.

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4.How do predators (猎食动物) affect populations of the prey (猎物) animals?The answer is not as simple as might be thought.The Moose(麋鹿) reached Isle Royale in Lake Superior by crossing over winter ice and bred freely there in isolation without predators.When wolves later reached the island,naturalists widely assumed that the wolves would play a key role in controlling the moose population.Careful studies have demonstrated,however,that this is not the case.The wolves eat mostly old or diseased animals that would not survive long anyway.In general,the moose population is controlled by food availability,disease and other factors rather than by wolves.
When experimental populations are set up under simple laboratory conditions,the predator often wipes out its prey and then becomes extinct itself.However,if safe areas like those prey animals have in the wild are provided,the prey population drops to low level but not extinction.Low prey population levels then provide inadequate food for the predators,causing the predator population to decrease.When this occurs,the prey population can rebound.In this situation the predator and prey population may continue in this cyclical pattern for some time.
Population cycles are characteristic of small mammals,and they sometimes appear to be brought about by predators.Ecologists studying hare populations have found that the North American snowshoe hare follows a roughly ten-year cycle.Its numbers fall tenfold to thirty in a typical cycle,and a hundredfold change can occur.Two factors appear to be generating the cycle:food plants and predators.
The preferred foods of snowshoe hares are tender willow branches.As the hare population increases,the quantity of these branches decreases,forcing the hares to feed on low-quality high-fiber food.Lower birth rates and low growth rates follow,so there is a corresponding decline in hare abundance.Once the hare population has declined,it takes two to three year for the quantity of branches to recover.
A key predator of the snowshoe hare is the Canada lynx.The Canada lynx shows a ten-year cycle of abundance(大量) that parallels the abundance cycle of hares.As hare numbers fall,so do lynx numbers,as their food supply decreased.
Predators are an essential factor in maintaining communities that are rich and diverse in species.Without predators,the species that is the best competitor for food,shelter,and other environmental resources tends to dominate and exclude the species with which it competes.This phenomenon is known as"competitor exclusion".However,if the community contains a predator of the strongest competitor species,then the population of that competitor is controlled.Thus even the less competitive species are able to survive.From the stand point of diversity(多样性),it is usually a mistake to eliminate a major predator from a community.

73.The author uses the example of the moose and wolves on Isle Royale toB.
A.provide evidence that predators influence prey populations
B.question the belief in the effect of predators on prey populations
C.demonstrate predator population grows faster than that of the prey
D.prove that studies of isolated populations tend to be useful
74.The word"rebound"in the passage is closest in meaning toD.
A.React
B.Resist
C.Remain
D.Recover
75.Which of the following is true according to the passage?A
A.Laboratory results can't explain the changes in predator and prey populations of the wild.
B.The growth of hare population may lead to a corresponding increase in its birth rates.
C.The experimental environments can promote the growth of predator and prey populations.
D.The existence of a major predator in a community is a threat to the diversity of species.
76.What can we conclude from the passage about the cycle of the Canada lynx?C
A.When hare numbers decrease,lynx numbers increase.
B.It has a great effect on the number of snowshoe hare.
C.It closely follows the cycle of the snowshoe hare.
D.It is not directly related to the availability of lynx food.
77.What is the best title of this passage?B
A.What role predators play in keeping competitor species.
B.Whether predators have an impact on prey populations.
C.A study of the populations of the predator and prey animals.
D.Contributing factors of the changes in animal populations.

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