单项选择题

Most of the participants slept for 7 hours a night during the study.

A． Right
B． Wrong
C． Not mentioned
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单项选择题
More than one million Americans participated in the six-year study.
A． Right
B． Wrong
C． Not mentioned
单项选择题
The study was the first to tell the difference between 7 and 8 hours of sleep a night.
A． Right
B． Wrong
C． Not mentioned
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