单项选择题

The study shows that the longer you sleep each night，the longer you’11 live．（）

A．Right
B．Wrong
C．Not mentioned

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单项选择题
All the participants were from the state of California．（）

A．Right
B．Wrong
C．Not mentioned
单项选择题
More than 1’1 million Americans participated in the six-year study．（）

A．Right
B．Wrong
C．Not mentioned
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