单项选择题

Parachutes are not a new invention.

A．a valuable
B．a lucky
C．a recent
D．an unknown
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单项选择题
One of the responsibilities of the Coast Guard is to make sure that all ships obediently follow traffic rules in busy harbors.
A．skillfully
B．safely
C．dutifully
D．currently
单项选择题
Not everyone is a good candidate for liposuction.
A．A．Right
B．B．Wrong
C．C．Not mentioned
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