单项选择题

Educational TV stations offer teaching in various ______ ranging from home nursing to art appreciation.

A．courses
B．directions
C．points
D．subjects
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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
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
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