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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The dentist has decided to extract her bad tooth.
A．take out
B．break off
C．push in
D．dig up
单项选择题
While we don't agree, we continue to be friends.
A．Whoever
B．Where
C．Although
D．Whatever
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