单项选择题

All the participants were from the state of California.

A． Right
B． Wrong
C． Not mentioned
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单项选择题
The findings indicate that it is all right to sleep for 6.5 hours a night.
A． Right
B． Wrong
C． Not mentioned
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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