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programmed
解析 上句提到造成睡眠不足的一个原因是生理习性，本句再次出现biologically“在生理上”，并且前面出现了be 动词，结合录音填入动词的过去分词programmed“按某种方式行事”。
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