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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 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
continue to do this, human life on the earth   5   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 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 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

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