In the past,man didn’t have to think about the protection of his environment.There were few people on the earth,and natural resources seemed to be___1___.Today things are ___2___.The world has become too___3___.We are using up our natural resources

In the past,man didn’t have to think about the protection of his environment.There were few people on the earth,and natural resources seemed to be___1___.Today things are ___2___.The world has become too___3___.We are using up our natural resources
In the past,man didn’t have to think about the protection of his environment.There were few people on the earth,and natural resources seemed to be___1___.
Today things are ___2___.The world has become too___3___.We are using up our natural resources too quickly,and at the same time we are___4___ our environment with dangerous chemicals.If we ___5___ to do this,human life on the earth will not survive.
Everyone___6___today that if too many fish are taken from the sea,there will soon be none left.Yet,with modern fishing___7___ more and more fish are caught.We know that if too many trees are cut down,___8___ will disappear and nothing will grow on the land.Yet,we___9___ to use bigger and more powerful machines to___10___ more and more trees.
We realize that if rivers are polluted with waste products from factories,we will die.___11___,in most countries wastes are___12___ put into rivers or into the sea,and there are___13___ laws to stop this.
We know,too,that if the___14___ of the world continues to rise at the present rate,in a few years,there will not be enough___15___.What can we do to solve these problems?
If we eat more vegetables and less___16___,there will be more food available for anyone.Land that is used to grow crops___17___ five times more people than land where animals are kept.
Our natural resources will___18___ longer if we learn to recycle them.The world population will not rise so quickly if people use modern methods of birth___19___.
Finally,if we educate people to think about the problems,we shall have a better and cleaner___20___ in the future.
1.A.beautiful B.unlimited C.care D.valuable
2.A.common B.the same C.changeable D.different
3.A.crowded B.small C.dirty D.busy
4.A.protecting B.saving C.polluting D.fighting
5.A.try B.continue C.decide D.have
6 A.wonders B.realizes C.considers D.discovers
7.A.poles B.boats C.methods D.ideas
8.A.mountains B.the sea C.trees D.forests
9.A.continue B.have C.ought D.stop
10.A.grow B.plant C.save D.cut down
11.A.Thus B.However C.Generally speaking D.Therefore
12.A.still B.even C.also D.few
13.A.too many B.a few C.some D.few
14.A.production B.pollution C.population D.revolution
15.A.houses B.vegetables C.food D.lives
16.A.fruit B.meat C.fish D.grain
17.A.feeds B.increases C.supplies D.helps
18.A.use B.stay C.keep D.last
19.A.control B.born C.plan D.reward
20.A.nature B.sea C.planet D.forest

In the past,man didn’t have to think about the protection of his environment.There were few people on the earth,and natural resources seemed to be___1___.Today things are ___2___.The world has become too___3___.We are using up our natural resources
1.B - unlimited
2.D - different
3.A- crowded
4.C - polluting
5.B - continue
6.B - realizes
7.C- methods
8.D - forests
9.A- continue
10.D- cut down
11.B - however
12.A - still
13.D - few
14.C - population
15.C - food
16.B- meat
17.A - feeds
18.D- last
19.A - control
20.C- planet