单项选择题

Sleeping for less than 5 hours each night is better than sleeping for 5 hours.

A． Right
B． Wrong
C． Not mentioned
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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
单项选择题
More than one million Americans participated in the six-year study.
A． Right
B． Wrong
C． Not mentioned
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