There are seas, lakes and forests on the earth. There are cities, towns and farms, too. All these things are environments (环境). The environments is everything around you. It can be living(有生命的), like a forest. It can be non-living (无生命的)   1   a rock or a mountain.

No living thing can live   2  . Every living thing depends(依靠)on other things in its environment. When something   3   ,it affects(影响)something else. If a non-living thing like water becomes   4   to find, plants will be affected. If all plants   5   , the animals that eat plants will be affected.

Weather, such as(例如)temperature, wind and rain, can change an environment.    6   can change an environment, too. Some things that people do cause(引起)   7   change or only a small change in the environment. For example, people can   8   the forest and just travel around. They can cut down only a few trees and   9   change the environment very much. On the other hand(另一方面) some things that people do cause   10   changes. Sometimes they can change   11   environment by cutting down a forest.

  12   changes are bad. If we cut down a forest to build houses or plant crops(庄稼), this may not be bad. But what would happen if we cut down all trees in all forests or if we don’t   13    some and plant something else?

It is clear that people are able to   14   an environment. This is why it is important to think about the changes before we make it. Let’s all work together to   15   it clean and healthy.

1.(   ) A. with      B. like      C. on       D. as

2.(   ) A. alone      B. lonely     C. himself    D. together

3.(   ) A. lives      B. becomes    C. changes     D . begins

4.(   ) A. dry      B. less      C. easy      D. difficult

5.(   ) A. live       B. lose      C. hurt      D. die

6.(   ) A. Those      B. Plants     C. Animals    D. People

7.(   ) A. much      B. a great     C. no       D. never

8.(   ) A. walk through   B. cut down   C. find out     D. work on

9.(   ) A. still not     B. still     C. even      D. even not

10.(   ) A. little      B. a lot of    C. a small     D. no

11.(   ) A. nothing of    B. a bit of    C. a part of    D. a whole

12.(   ) A. Not all     B. Not every    C. All      D. No

13.(   ) A. use       B. build     C. save      D. kill

14.(   ) A. develop     B. break     C. change     D. invent

15.(   ) A. change      B. keep      C. have      D. let

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