题目内容：

Taking away a city's rubbish is a big job. Every day trucks come into a city to collect them. Most rubbish is made up of things we can't eat or use. If we keep these things, we would soon have a mountain of rubbish.

In some cities the rubbish is collected and taken outside the city to a dump (垃圾场). Often the city dump is placed where the ground is low or where there is a big hole. The kitchen rubbish is broken into small pieces and sent into the sewage system. The sewage system takes away the used water from toilets, bathtubs and other places.

To keep mice and flies (苍蝇) away, some earth is used to cover the newly dumped rubbish. Later, grass may be planted on the rubbish -filled land. Finally, a house or a school may be built there, and then you'd never know that this had once been an old rubbish dump.

In other cities rubbish is burnt in special places. The fire bums everything but the metal. Sometimes the metal can be used again in factories where things are made of metal. The food parts of rubbish are put in special piles (堆) where they slowly change into something called humus (腐蚀质), which looks like black earth. It is rich with the kinds of things that feed plants and help them grow.

根据材料内容,选择最佳答案,并将其标号填入题前括号内。

1.You can most probably read the passage in ________.

A. a science book    B. a TV guide

C. a history book    D. a telephone book

2.The main idea of the passage is ________.

A. to let us know taking away rubbish is a big job

B. to explain the need for rubbish collection

C. to introduce different ways to treat rubbish

D. to tell people to take useful things out of rubbish

3.The underlined word "sewage" in the passage means ________.

A. 排污    B. 染色    C. 洗涤    D. 吸尘

4.According to the passage, the food parts of rubbish can be used again ________.

A. to feed animals

B. to feed plants

C. to build a house

D. to make machines

5.How should we deal with a used metal box according to the passage?

A. To burn it off.    B. To put it in water.

C. To throw it away.    D. To reuse and recycle it.