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问题 单项选择题

手持电动工器具如有绝缘损坏、电源线护套破裂、保护线脱落、插头插座裂开或有损于安全的机械损伤等故障时，应立即进行修理，在未修复前，（ ）继续使用。

A．可以

B．不宜

C．不得

答案

参考答案：C

填空题

  Life today has brought about new problem. One of the biggest problems of every nation is pollution. In America, there are laws ___66_____the air and water clean. These are new laws and it has taken much time __67____ a polluted river or lake. Now the fish are healthy again and people can enjoy __68_____in the clean water. 

When food is brought from the store to the home, it is packed in paper, glass, or plastic. Every day a newspaper comes to the home. Americans use __69_____all these materials in the garbage which was picked up by a large truck. The truck these materials to a garbage dump or a land-fill. The truck dumped the garbage into a large hole and then earth was pushed over the garbage until the hole was filled. Then, a new hole must be found.

As the years went by, the garbage increased as the population __70_______. Scientists suggested using some garbage again. They advised businessmen _____71____money by recycling or using paper, glass, and plastic again.

Now, a recycling truck comes to each home once a week __72_______ up materials. American families are told _____73_____their newspaper in boxes and clean all glass, and plastic. The truck takes them to factories for recycling.

Recycling is a way _____74_____the environment from pollution by __75_____ many materials again.
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单项选择题

在市场经济条件下，人们之间的经济关系及各种生产要素的结合，是通过（）来实现的。

A.劳动市场

B.市场和市场体系

C.经济调控

D.资源配置
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