填空题

This knife needs (sharply)（）

【参考答案】

sharpening/ to be sharpened
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According to the writer, the main problem to our environment today is（）

A．the increase of population
B．the limited energy resources
C．the more serious air pollution
D．the development of technology
填空题
Production went up (fast)（）in June than it did in the previous month.
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