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【题目】 Our dog Sandy is a golden retriever( 寻回犬). Once we performed an experiment to see how keen his nose was.There was one particular pile that must have had hundreds of sticks. We picked up one stick carved an X on it, walked away from the pile and then threw it back into the pile, not once but a dozen times into the pile. It was impossible for us to tell with any certainty which stick we had originally chosen. Each time he brought back that stick. It wasn't the shape or the size or the look of the stick that he used to pick it out from all the others. It was the smell we left on the stick. It is hard to imagine, but for dogs every living creature has its own distinctive smell.

The noses of people have about 5 million cells that sense smell. Dogs' noses have anywhere from 125 to 300 million cells. Moreover, these cells are closer to the surface than cells in our noses, and more active. It has been estimated that dogs such as Sandy have noses that are a million times more sensitive than ours. Clothes that we haven't worn for week,and places we've only touched lightly indicate our presence to dogs.

His ears are also remarkable. He can hear sounds that humans can't and at distances which are astonishing. It is over our head to know and understand that world. Yet we have the advantage of being able to imagine what his experience is like, though he probably doesn't think too much about how we see the world.

The environment is the world that all living things share. Living creatures are born into the environment and are part of it. Yet there is no creature who perceives (感知到) all of what is and what happens. For a dog like Sandy a book isn't much different than a stick, whereas for us one stick is pretty much like every other stick. There is no one world experienced by all living creatures.

1Why did the author conduct the experiment?

A.To train Sandy to pick out sticks.

B.To show how fast Sandy found sticks.

C.To prove sensitivity of Sandy's nose.

D.To teach Sandy to tell different smells.

2What does the author intend to do in paragraph 2?

A.Support the conclusion with numbers.

B.Summarize the previous paragraph.

C.Provide some advice for the readers.

D.Introduce a new topic for discussion.

3What does the underlined idiom in paragraph 3 mean?

A.Amazing.B.Difficult.

C.Reasonable.D.Inconvenient.

4Which of the following best expresses the author's opinion in the last paragraph?

A.Worlds to experience.

B.An environment to share.

C.No environment, no creatures.

D.One environment, many worlds.

【答案】

1C

2A

3B

4D

【解析】

本文是一篇说明文。作者做了一个实验证明Sandy的鼻子非常灵敏,耳朵也非常灵敏,借此说明环境是所有生物共享的世界,不同的物种对于环境有不同的感知。

1】细节理解题。根据第一段的Once we performed an experiment to see how keen his nose was.(我们做了一个实验,看看他的鼻子有多尖)可知,作者做这个实验是为了证明桑迪的鼻子很敏感。故选C

2】推理判断题。根据第二段的The noses of people have about 5 million cells that sense smell. Dogs' noses have anywhere from 125 to 300 million cells.(人类的鼻子有大约500万个可以感知气味的细胞。狗的鼻子有1亿25百万到3亿个细胞)可知,第二段用人类鼻子和狗的鼻子的细胞数进行对比来说明狗鼻子的灵敏度,由此判断出,作者在第二段中用数字来支持结论。故选A

3】词义猜测题。根据第三段的It is over our head to know and understand that world. Yet we have the advantage of being able to imagine what his experience is like(我们无法了解那个世界。然而,我们的优势是能够想象他的经历是什么样的)可知句中yet意为然而,跟前句是转折关系,we have the advantage of意为我们有……的优势,所以对比前文的over our head是与之相反的意思,over our head意为困难的,相当于difficult,故选B

4推理判断题。根据最后一段的The environment is the world that all living things share. Living creatures are born into the environment and are part of it. Yet there is no creature who perceives all of what is and what happensThere is no one world experienced by all living creatures.(环境是所有生物共享的世界。生物出生在环境中,是环境的一部分。然而,没有一种生物能感知一切的存在和发生。没有一个世界是所有生物都经历过的)可知,任何一种生物都不能完全地体会到一个世界,由此判断出,最能表达作者观点的是一个环境、多个世界。故选D

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