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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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
单项选择题
The dentist has decided to extract her bad tooth.
A．take out
B．break off
C．push in
D．dig up
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