3 . 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 _______.
Today things are _______. The world has become too _______. We are using up our natural resources too quickly, and at the same time we are _______ our environment with dangerous chemicals. If we continue to do this, human life on the earth _______ not survive (生存).
Everyone _______ today that if too many fish are taken from the sea, there will soon be none left. Yet, with modern fishing _______, more and more fish are caught. We know that if too many trees are cut down, _______ will disappear and nothing will grow on the land. Yet, we _______ to use bigger and more powerful machines to ________ more and more trees.
We realize that if rivers are polluted with waste products from factories, we will die. ________, in most countries wastes are ________ put into rivers or into the sea, and there are ________ laws to stop this.
We know, too, that if the ________ of the world continues to rise at the present rate, in a few years there will not be enough ________. What can we do to solve these problems?
If we eat more vegetables and less ________, there will be more food available for everyone. Land that is used to grow crops ________ five times more people than land where animals are kept.
Our natural resources will ________ longer if we learn to recycle them.
The world population will not rise so quickly if people use modern methods of birth ________.
Finally, if we educate people to think about the problems, we shall have a better and clearer ________ in the future.
1. A.beautiful | B.unlimited | C.rare | D.valuable |
2. A.common | B.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.may | B.will | C.shall | D.could |
6. A.wonders | B.realizes | C.considers | D.discovers |
7. A.poles | B.boats | C.methods | D.ideas |
8. A.mountains | B.seas | C.trees | D.forests |
9. A.continue | B.have | C.start | D.go |
10. A.give up | B.go out | C.come down | D.cut down |
11. A.Thus | B.However | C.Generally | D.Therefore |
12. A.still | B.even | C.also | D.certainly |
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. 19. A.control | B.protection | C.plan | D.reward |
20. A.nature | B.sea | C.planet | D.forest |