2. 外语
  3. Surveys of American teenagers find that about half of them do not get enough sleep on school nights. They get an average of sixt

Surveys of American teenagers find that about half of them do not get enough sleep on school nights. They get an average of sixt

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问题     Surveys of American teenagers find that about half of them do not get enough sleep on school nights. They get an average of sixty to ninety minutes【11】experts say they need.
    One reason for this deficit is biology. Experts say teens are biologically【12】to go to sleep later and wake up later than other age groups. Yet many schools start classes【13】seven in the morning.
    As a result, many students go to class【14】like sixteen-year-old Danny. He plays two sports, lacrosse and football. He is an【15】teen—except in the morning.
  
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答案active
解析 上句提到16岁的Danny从事了两项运动，因此他是一个活跃的少年。结合录音填入active“活跃的”。
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