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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单项选择题
The mayor didn’t have time so far to go into it ________, but he gave as an idea about his plan.
A．in conclusion
B．at hand
C．at length
D．in turn
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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