题目内容
In the past, man did not have to think about the protection of his environment．There were few people on the earth, and natural resources seemed to be enough.
Today things are 36 , the world has become too crowded. We are using up our natural resources too quickly and at the same time we are polluting our environment with dangerous chemicals. If we keep doing this, human life on the earth 37 survive(生存）.
Everyone realizes today that if 38 fishes are taken from the sea, there will soon be none left. Yet, with modern fishing ways, more and more fishes are caught. We know that if lots of trees are cut down, forests will disappear and nothing will grow on the earth. Yet we 39 to use bigger and more powerful machines to cut down trees.
We realize that if rivers 40 with waste products from factories, fish will die. 41 , in most countries wastes are still put into rivers or into the sea.
We know, too, that if the 42 of the world keep on rising at the present rate, in a few years there will not be enough food. What can we do to solve these problems? If we eat 43 , there will be more food for everyone．Land that is used to grow crops feeds five times more people than land where animals are kept．
Our natural resources will 44 longer if we learn to recycle them．
Finally, if we educate people to think about the problems, we shall have a better and cleaner 45 in the future.
36. A. common B. the same C. changeable D. different
37. A. may not B. will not C. shall not D. could not
38. A. too many B. many too C. too much D. much too
39. A. continue B. have C. ought D. decide
40. A. pollute B. will pollute C. are polluted D. are polluting
41. A. And B. However C. Generally D. Therefore
42. A. production B. pollution C. population D. Development
43. A. more vegetables and less meat B. less vegetables and more meat
C. more vegetable and more meat D. less vegetable and less meat
44. A. use B. stay C. keep D. last
45. A. nature B. sea C. planet D. forest
DBAAC BCADC
