to too much sunlight, as is generally considered, will add to the potential of catching skin cancer. A. Being exposed B. Exposed C. Exposing D. To expose 题目和参考答案——青夏教育精英家教网—

题目内容

______ to too much sunlight, as is generally considered, will add to the potential of catching skin cancer.

A. Being exposed B. Exposed 　 C. Exposing 　　 D. To expose

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Sadly, Marie Curie died from ______________ to too much radiation.

If your head is overheating, you are very likely to yawn(打哈欠) soon, according to a new study that has found the main purpose of yawning is to control brain temperature. The study explains several mysteries about yawning, such as why it’s most commonly done just before and after sleeping, why certain diseases lead to too much yawning, and why breathing though the nose often stops yawning.
“Brains are like computers,” Andrew Gallup, a researcher in the department of Biology at Binghamton University who led the study, said. “They operate best when cool.”
He and his co-workers Micheal Miller and Anne Clark did researches on yawning in parakeets(长尾小鹦鹉) , which have relatively large brains, live wild in Australia, often experience temperature changes, and, most importantly, do not yawn when others yawn, as humans and some other animals do.
For the study, the scientists put parakeets under three different conditions: increasing temperature, high temperature and normal temperature. While the frequency(频率) of yawns did not increase under the latter two conditions, it increased greatly when the researchers increased the temperature.
It’s now believed yawning operates like a radiator(散热器).
If air in the atmosphere is cooler than the brain and body temperatures, taking it in quickly cools blood, which in turn cools the brain. The new findings also explain why tired people often yawn. Both tiredness and sleep loss can increase brain temperature, while yawning can cool down the brain.
In the future, researchers may focus more on brain temperature and its role in diseases and their symptoms. But the new study on yawning changes the popular idea that yawns are just signs of getting tired of something.
49. What’s the best title for the passage?
A. Why don’t people yawn at normal temperature?
B. The yawn explained—it cools your brain.
C. Yawning operates like a radiator.
D. The cause of yawning—finally found out.
50. The main reason why researchers chose parakeets to do the research is that parakeets______.
A. have very large brains
B. live wild in Australia
C. are not affected by others’ yawning
D. experience frequent temperature changes
51. The writer may suggest doing all of the following to stop yawning EXCEPT______.
A. breathing through the nose
B. turning up the heat
C. enjoying some cool wind
D. putting a cold towel on your forehead
52. In which section of a newspaper would you most probably read this passage?
A. Discovery.        B. Education.         C. Health.              D. Mystery.

Peter has treated himself to too much delicious food，????? his sharp increase in weight

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Many French teachers and parents complain that their kids are less bright than they were. They say young people visit museums less often and spend too much time on the Internet. They only read comics and listen to music, and like American culture more than their own. But is this true? A recent survey shows that many French kids spend their time as other kids always have.

Most French teens love music, with 86% putting it as their top hobby, above the cinema, sport and television. French kids read a lot and like different things, from Japanese cartoons to American novels. Many French people worry that their children watch too many American films and listen to too much American music. But the results of this survey show that French young people like their own culture.

As Silvia Berlin, a student from Paris, says, "I love watching American TV, but I watch more French programmes. I love being French!"

1.Many French teachers and parents

A. think their kids are as clever as they were

B. don' t think their kids are as clever as they were

C. think their kids are more clever than they were

D. don' t think their kids are clever at all

2.Most French teens' top hobby is

A. going to the movies B. doing sport

C. watching TV D. listening to music

3.The French kids like all of the following except _________ .

A. Japanese history B. Japanese cartoons

C. American films D. American music

4.This passage is mainly about a survey of______.

A. French parents' complaint

B. French kids' study

C. French kids' interests

D. French teachers' complaint

Sadly, Marie Curie died from ______________ to too much radiation.

A．being exposed B．exposing C．exposed D．having exposed

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