More than one million Americans participated in the six-year study. Most of the participants slept for 7 hours a night during t

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问题 More than one million Americans participated in the six-year study.
Most of the participants slept for 7 hours a night during the study.

选项 A、Right
B、Wrong
C、Not mentioned

答案C

解析

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职称英语卫生类B级

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