单项选择题

He chainsmokes like a chimney ______, he has developed a constant cough.

A．out of the question
B．out of question
C．small wonder
D．out of order
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单项选择题
We shouldn't expect a technical innovation can be made perfect overnight. It has to be improved ______ in fact.
A．from cover to Cover
B．at a good pace
C．in succession
D．step by step
单项选择题
The government has strictly carried out the policy of birth control, thus resulting in the ______ of the population in our city.
A．turning down
B．dropping out
C．leveling off
D．holding up
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