More than one million Americans participated in the six-year study. The study was the first to tell the difference between 7 an

admin2009-06-15  43

问题 More than one million Americans participated in the six-year study.
The study was the first to tell the difference between 7 and 8 hours of sleep a night.

选项 A、Right
B、Wrong
C、Not mentioned

答案A

解析
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