答案:to
5.解析:though the laser was invented only twenty years ago虽然激光在20年前才被发明,在这里表示转折。
答案:Though
6.解析:as well as固定结构。
答案:well
7.解析:even在这里表示更多的,更深的。
答案:even
8.解析:the key to……的答案。
答案:to
9.解析:make use of利用,make在这里要用动名词形式。
答案:making
10.解析:形容词作定语。
答案:powerful
.阅读理解
A recent study conducted by researchers at the University of Michigan's Center for Human Growth and Development shows that children aged 9 to 12 who sleep less than nine hours a night can have real problems with gaining weight.
Dr. Julie Lumeng,lead author of the report said,“Many children aren't getting enough sleep,which may not only make them annoyed or prevent them from being active and ready to learn at school,but also lead to a higher risk of being overweight.”Reuters reports.
She also said that children who sleep more than 10 hours a night are more willing to play and consume their energy,rather than staying in bed or watching TV as their tired fellows do.
It is also said that hormonal (荷尔蒙) changes brought on by a lack of sleep can lead to an increased appetite.
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2017-04-24
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