根据下面内容，回答下面试题

Suppose we built a robot to explore the planet Mars(火星). We provide the robot with seeing detectors to keep it away from danger. It is powered entirely by the sun. Should we program the robot to be equally active at all times? No. The robot would be using up energy at a time when it was not receiving any. So we would probably program it to cease its activity at night and to wake up at dawn the next morning.

According to the evolutionary theory of sleep, evolution equipped us with a regular pattern of sleeping and waking for the same reason. The theory does not deny that sleep provides some important restorative(促进康复的 ) functions. It merely says that evolution has programmed us to perform those functions at a time when activity would be inefficient and possibly dangerous. However, sleep protects us only from the sort of trouble we might walk into; it does not protect us from trouble that comes looking for us. So we sleep well when we are in a familiar, safe place, but we sleep lightly, if at all, when we fear that bears will nose into the tent.

The evolutionary theory accounts well for differences in sleep among creatures. Why do cats, for instance, sleep so much, while horses sleep so little? Surely cats do not need five times as much repair and restoration as horses do. But cats can afford to have long periods of inactivity because they spend little time eating and are unlikely to be attacked while they sleep. Horses must spend almost all their waking hours eating, because what they eat is very low in energy value. Moreover, they cannot afford to sleep too long or too deeply, because their survival depends on their ability to run away from attackers.

第21题单选 The author uses the example of the robot in space exploration to tell us __________.

A. the difference between robots and men

B. the reason why men need to sleep

C. about the need for robots to save power

D. about the danger of men working at night

参考答案：B

第22题单选 Evolution has programmed man to sleep at night chiefly to help him __________.

A. maintain a regular pattern of life

B. prevent trouble that comes looking for him

C. avoid danger and inefficient labor

D. restore his bodily functions

参考答案：C

第23题单选 According to the author, we cannot sleep well when we __________.

A. are worrying about our safety

B. are overworked

C. are in a tent

D. are away from home

参考答案：A

第24题单选 Cats sleep much more than horses do partly because cats__________.

A. need more time for restoration

B. are unlikely to be attacked

C. are more active than horses when they are awake

D. spend less time eating to get enough energy

参考答案：D

第25题单选 Which of the following is the main idea of the passage?

A. Evolution has equipped all creatures with a regular pattern of sleeping and waking.

B. The study of sleep is an important part of the evolutionary theory.

C. Sleeping patterns must be taken into consideration in the designing of robots.

D. The sleeping pattern of a living creature is determined by the food it eats.

参考答案：A

根据下面内容，回答下面试题

That cold January night, I was growing sick of my life in San Francisco. There I was, walking home at one in the morning after a tiring practice at the theatre. With opening night only a week away, I was still learning my lines. I was having trouble dealing with my part-time job at the bank and my acting at night at the same time. As I walked, I thought seriously about giving up both acting and San Francisco. City life had become too much for me.

As I walked down empty streets under tall buildings, I felt very small and cold. I began running, both to keep warm and to keep away from any possible robbers. Very few people were still out except a few sad-looking homeless people under blankets.

About a block from my apartment, I heard a sound behind me. I turned quickly, half expecting to see someone with a knife or a gun.

The street was empty. All I saw was a shining streetlight. Still, the noise had made me nervous, so I started to run faster. Not until I reached my apartment building and unlocked the door did I realize what the noise had been. It had been my wallet failing to the sidewalk.

Suddenly I wasn' t cold or tired anymore. I ran out of the door and back where I' d heard the noise. Although I searched the sidewalk anxiously for fifteen minutes, my wallet was nowhere to be found.

Just as I was about to give up the search, I heard the garbage truck pull up to the sidewalk next to me. When a voice called from the inside, "Alisa Camacho?" I thought I was dreaming. How could this man know my name? The door opened, and out jumped a small red-haired man with an amused look in his eye. "Is this what you' re looking for?" he asked, holding up a small square shape.

It was nearly 3 A.M. by the time I got into bed. I wouldn' t get much sleep that night, but I had gotten my wallet back. I also had gotten back some enjoyment of city life. I realized that the city couldn' t be a bad place as long as people were willing to help each other.

第26题单选 How did the writer feel when she was walking home after work?

A. Cold and sick.

B. Fortunate and helpful.

C. Satisfied and cheerful.

D. Disappointed and helpless.

参考答案：D

第27题单选 From the first paragraph, we learn that the writer was busy__________.

A. solving her problem at the bank

B. taking part in various city activities

C. learning acting in an evening school

D. preparing for the first night show

参考答案：D

第28题单选 On her way home the writer__________.

A. lost her wallet unknowingly

B. was stopped by a garbage truck driver

C. was robbed of her wallet by an armed man

D. found some homeless people following her

参考答案：A

第29题单选 In the fifth paragraph, why did the writer say she was dreaming?

A. Someone offered to take her back home.

B. A red-haired man came to see her.

C. She heard someone call her name.

D. Her wallet was found in a garbage truck.

参考答案：C

第30题单选 From the text, we can infer that the writer__________.

A. would stop working at night

B. would stay on in San Francisco

C. would make friends with cleaners

D. would give up her job at the bank

参考答案：B

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