单项选择题

It's sensible to start any exercise program gradually at first.

A．workable
B．reasonable
C．possible
D．available
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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
单项选择题
This table is strong and durable.
A．long-lasting
B．extensive
C．far-reaching
D．eternal
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