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问题 单项选择题

若需要进行气体检测的，在许可证审批前必须经气体检测合格。同时，在作业方案注明工作期间的气体检测（），许可证得到批准后，申请人负责按照检测要求进行气体检测，填写气体检测记录。

A.时间

B.频次

C.时间和频次

D.浓度

答案

参考答案：C

选择题

——last week’s snow and this week’s rain really do good to the drought-hit areas, which will contribute to the growth of crops.

——Leaders at all levels and farmers ____________________.

A cry for the moon        B are off the top of their head

C are over the moon       D kill the fatted calf

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选择题

Peter took advantage________ his visit to Paris to improve his French.

A．on

B．at

C．with

D．of
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