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


  1. A.
    Being exposed
  2. B.
    Exposed
  3. C.
    Exposing
  4. D.
    To expose
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科目：高中英語(yǔ) 來(lái)源：2012-2013學(xué)年福建省晉江市季延中學(xué)高二下學(xué)期期中考試英語(yǔ)試卷（帶解析） 題型：單選題

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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.
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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.

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