单项选择题

Very few scientists ______ completely new answers to the world's problems.

A．come up with
B．come out
C．come round
D．come up to
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单项选择题
The price of seafood used to be much lower than now, ______
A．wasn't there
B．wasn't it
C．doesn't it
D．didn't it
单项选择题
For many patients, institutional care is the most _______ and beneficial form of care.
A．pertinent
B．appropriate
C．acute
D．persistent
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