to too much sunlight, as is generally considered, will add to the potential of catching skin cancer.A．Being exposedB．ExposedC．ExposingD．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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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.
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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.
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