Natural resources are things that we use and they come from the Earth .Our natural resources are limited (有限的) . This means that they will not 16 forever.Some are renewable,like trees. We can plant a new tree when we 17 one down.Others are not renewable,like coal (煤) . When we dig coal out of the 18 and it is used,it is gone.

      People realize the 19 that the Earths natural resources are limited,and that they can do things to help conserve (节约) those resources. 20 you try to conserve a natural resource,you try to use less of it so it does not get used up so 21 One way that people conserve fuel,like gasoline,is by riding a bicycle or walking when the 22 is short instead of driving.

      Water is a very important natural resource because we all need it to stay 23 We can conserve water 24 making sure that our pipes and taps do not leak (漏) .We can also make 25 choices to conserve water. Everyone can make contributions to protecting natural resources.

16. A. last   B. spread   C. burn   D. change

17. A. turn   B. cut   C. put   D. move

18. A. station   B. building   C. ground   D. brick

19. A. news   B. plan   C. decision   D. fact

20. A. When   B. Although   C. Whatever   D. Whether 

21 .A. slowly   B. hard   C. regularly   D. fast

22. A. money   B. space   C. place   D. distance

23. A. alive   B. alone   C. asleep   D. awake

24. A. about   B. for   C. by   D. with

25. A. generous   B. funny   C. wise   D. surprising

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