2012年度全国职称英语等级考试理工类C级模拟试题（一）(2)

最佳选项。 第一篇

Making Light of Sleep

All we have a clock located inside our brains. Similar to your bedside alarm clock,

your internal clock runs on a 24-hour cycle. This cycle, called a circadian rhythm, helps to control when you wake, when you eat and when you sleep.

Somewhere around puberty, something happens in the timing of the biological

clock. The clock pushes forward, so adolescents and teenagers are unable to fall asleep as early as they used to. When your mother tells you it’s time for bed, your body may be pushing you to stay up for several hours more. And the light coming from your computer screen or TV could be pushing you even later.

This shift is natural for teenagers. But staying up very late and sleeping late can

get your body’s clock out of sync with the cycle of light and dark. It can also make it hard to get out of bed in the morning and may bring other problems, too. Teenagers are put in a kind of a gray cloud when they don’t get enough sleep, says May Carskadon, a sleep researcher at Brown University in Providence, RI. It affects their mood and their ability to think and learn.

But just like your alarm o’clock, your internal clock can be reset. In fact, it

automatically resets itself every day. How? BY using the light it gets through your eyes.

Scientists have known for a long time that the light of day and the dark of night

plays important roles in setting our internal clocks. For years, researchers thought that the signals that synchronize the body’s clock were handled through the same pathways that we use to see.

But recent discoveries show that the human eye has two separate light-sensing

systems. One system allows us to see. The second system tells our body whether it’s day or night.

31. The clock located inside our brain is similar to our bedside alarm o’clock because ______________.

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A. it controls when we wake, when you eat and when you sleep. B. it has a cycle of 24 hours.

C. it ahs a cycle called a circadian rhythm D. it can alarm any time during 24 hours

32. What is implied in the second paragraph?

A. Young children’s biological clock has the same rhythm with that of the teenagers. B. People after puberty begin to go to bed earlier due to the change of the biological clock.

C. Children before puberty tend to fall asleep earlier at night than adolescents. D. Teenagers go to bed later than they used to due to the light from the computer screen.

33. In the third paragraph, the author wants to tell the reader that _________. A. it is natural for teenagers to stay up late and get up late

B. staying up late has a bad effect on teenagers’ ability to think and learn C. during puberty most teenagers experience a kind of gray cloud D. it is hard for teenagers to get out of bed in the morning

34. Which of the following statements is NOT true according to the fourth and fifth paragraphs?

A. Our biological clock resets itself automatically.

B. Light gets through our eyes and resets our biological clock.

C. Our internal clock as well as the alarm clock can be reset automatically. D. Our internal clock, like the alarm clock, can be reset.

35. According to the last two paragraphs, what did the previous researchers think about the human eye’s light-sensing system? A. The human eye had two light-sensing systems. B. The human eye had one light-sensing system.

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C. The human eye could sense the light of day more quickly than the dark of night. D. The human eye could reset our internal clocks in accordance with the alarm clock. 第二篇

Motoring Technology

1.2 million road deaths worldwide occur each year, plus a further 50 million injuries. To reduce car crash rate, much research now is focused on safety and new fuels-though some electric vehicle and biofuel research aims at going faster. Traveling at speed has always been dangerous. One advanced area of research in motoring safety is the use of digital in-car assistants. They can ensure you don't miss important road signs or fall asleep. Most crashes result from human and not mechanical faults.

Some safety developments aim to improve your vision. Radar can spot obstacles in fog, while other technology “sees through” big vehicles blocking your view. And improvements to seat belts, pedal（脚踏）controls and tyres are making driving smoother and safer. The color of a car has been found to be linked with safety, as have, less surprisingly, size and shape.

But whatever is in the fuel tank, you don't want a thief in the driving seat and there have been many innovations（创新）.Satellite tracking and remote communications can also come into play if you crash, automatically calling for help. Accidents cause many traffic jams, but there are more subtle interplays between vehicles that can cause jams even on a clear but busy road. Such jams can be analyzed using statistical tools. Robotic drivers could be programmed to make traffic flow smoothly and will perhaps one day be everyone’s personal chauffeur（司机）,but their latest efforts suggest that won't be soon.

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36.To reduce car crash rate, many scientists are working hard to A. design fully automatic cars. B. develop faster electric vehicles.

C. analyze road deaths occurring worldwide each year. D. improve the safety of cars and develop new fuels.

37. According to the second paragraph, most road accidents happen due to A. heavy traffic. B. human mistakes. C. engine failure. D. bad weather.

38. Which of the following safety developments is NOT mentioned in the passage?

A. Windscreens that can help drivers to improve t …… 此处隐藏：5353字，全部文档内容请下载后查看。喜欢就下载吧 ……