It's very important that we all recycle. In na?ture,everything 1        again. For example,when an animal dies,it becomes 2        animal's food. Nothing is wasted. But humans have created things like plastic bags which can't be 3        down by nature. Our 4        kills animals and pollutes water and soil.5 we continue making too much rub?bish,the problem will only get worse. If nature can't reuse the rubbish,we must recycle 6        We should clean up the rubbish we've made because na?ture can't.

  Recycling is also the right thing to do for another reason. The earth is rich in natural materials like water and trees,7        these materials are not end-less (無(wú)盡的) ,We use up our natural materials 8        faster than the earth is able to reproduce (再生) them. For example* each year we cut 9        more than 6        ,000 square miles of forest. But it takes an average of 25 years for a new tree 10     .

  Recycling can help us save the earth,so let's take action right now.

(   ) 1. A. use   B. is used

   C. used   D. to use

(   ) 2. A. another   B. others

   C. the other   D. the others

(   ) 3. A. lain   B. broken

   C. put   D. pull

(   ) 4. A. rubbish   B. nature

   C. material   D. pollute

(   ) 5. A. When   B. Why

   C. If   D. Unless

(   ) 6. A. them   B. it

   C. itself   D. themselves

(   ) 7. A. but   B. so

   C. and   D. although

(   ) 8. A. very   B. more

   C. much   D. many

(   ) 9. A. out   B. down

   C. up   D. off

(   ) 10. A. grows   B. growing   C. to grow   D. grown

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