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

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

  To keep nice and flies 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 school may be built there, and then you’d never know that this had once an old rubbish dump.

  In other cities the rubbish is burnt in special places. The fire burns everything but the metal. Sometimes the metal can be used again in factories where they slowly change into something called humus, which looks like black earth. It is rich with the kinds of things that feel plants and help make them grow.

1 You can most probably read the passage in _________.

   A. a newspaper     B. a TV guide     C. a history book   D. a note book

2 The underline word “sewage” in the passage means _________.

   A. 洗涤           B. 染色         C. 排污          D. 抽水

3 How should we take care of a used metal box according to the passage?

   A. Bt burning it off.                  B. By putting it in the river.

   C. By throwing it away.               D. By reusing or recycling.

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

   A. to feed plants     B. to feed animals  C. the make machines D. to build a house

5 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 tell people to take useful things out of rubbish

   D. to introduce different ways to treat rubbish

6 The fire burns rubbish and everything is burnt and _________.

   A. nothing is left   B. metal is left   C. they all left   D. you can’t see anything

7 According to the passage, we can build houses, schools and so on _________.

   A. on the rubbish dump             B. on the sand

   C. in the river                     D. on the lake