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问题 单项选择题

根据《矿山安全法》规定，矿山企业必须对作业场所中的有毒有害物质和井下空气()进行检测，保证符合安全要求。

A.含氮量

B.含氢量

C.含氦量

D.含氧量

答案

参考答案：D

句型转换

句型转换。

l. There is a push-pin. It is holding up this piece of paper. (合并为一句)

   There is a push-pin_____ _____ this piece of paper.

2. He has a factory. It has a hundred machines. (合并为一句)

     He has a factory _____ a hundred machines.

3. How much is a push-pin today? (改为同义句)

    What's_____ _____ _____ a push-pin today? /How  much_____a  push-pin         _?

4. It was his big success.(改为同义句)

   He was very _____.

5. In 1900,a push-pin cost  $0.01. Today it costs  $0.05.(合并为一句)

   A push-pin is_____ _____today than in 1900.
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单项选择题

山野：猎人

A．生猪：屠宰厂

B．教室：学生

C．农民：农场

D．野兽：旷野
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