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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   1   .   Today things are2   , the world has become too   3   . We are using up our natural resources too quickly and at the same time we are4   our environment with dangerous chemicals．If we continue to do this, human life on the earth5   survivE.   Everyone  6  today that if too many fishes are taken from the sea, there will soon be none left. Yet, with modern fishing   7   , more and more fishes are caught. We know that if too many trees are cut down,   8   will disappear and nothing will grow on the earth. 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, fish will diE. 11  , in most countries wastes are12   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 for everyonE.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.beaut iful (  )2. A.common  (  )3. A.crowded  (  )4. A.protecting  (  )5. A.may not  (  )6. A.wonders  (  )7. A.poles (  )8. A.mountains  (  )9. A.continue  (  )10. A.grow (  )11. A.Thus (  )12. A.s till  (  )13. A.many (  )14. A.production (  )15. A.houses  (  )16. A.fruit  (  )17. A.feeds  (  )18. A.use (  )19. A.control  (  )20. A.nature	B.unlimited    B.the same  B.small   B.saving  B.will not  B.ealizes  B.boats   B.the sea B.have   B.pick up B.however B.even   B.no  B.pollution  B.vegetables  B.meat   B.increases  B.stay   B.born   B.sea	C.unusual   C.changeable C.dirty   C.polluting  C.shall not  C.considers  C.methods C.trees   C.ought   C.save   C.Generally  C.also C.some C.population C.food   C.fish   C.supplies   C.keep   C.plan   C.planet	D.valuable D.different   D.busy D.fighting   D.could not  D.discovers  D.ideas   D.forests D.decide  D.cut down   D.Therefore  D.never   D.few   D.development   D.places  D.grain D.helps   D.last D.pay  D.fores