Because of sleep loss, most American
A.have wide open eyes
B.are not fully alert
C.try to sleep more
D.live in the twilight zone

A.have
B.are
C.try
D.live

【参考答案】

B
正确答案是：B。本题考查句子分析能力。根据第二段的倒数第二句“MostAmericansnolongerkn......

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