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.
  
选项
答案as early as
解析 上句提到青少年睡眠不足，更适宜晚睡晚起；本句用Yet转折，意思是但是有很多学校早在七点就开始上课了。结合录音填入as early as。
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