单项选择题

In order to be a good scientist, ______.

A. mathematics is urgent
B. one should have the mathematics
C. one must understand mathematics
D. mathematics is important to be understood

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单项选择题

I believe watching TV is ______ listening to radio.

A. so good or better than
B. like good or better than
C. as good as or better than
D. as good as or better

单项选择题

Great efforts to increase wheat production must be made if bread shortages ______ avoided.

A. will be
B. can be
C. are to be
D. were to be

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