单选题：The research done by the Dement commission shows that Ameri

题目分类：卫生类
题目类型：单选题
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题目内容：

The research done by the Dement commission shows that Americans__________. A．don't like to take naps
B．are terribly worried about their national debt
C．sleep less than is good for them
D．have caused many industrial and traffic accidents

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