完形填空：閱讀下面短文，掌握其大意，然后從各題所給的四個選項中選出一個最佳答案。（共20小題，每小題1.5分）
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 46 . Today things are 47 , the world has 
become too 48 . We are using up our natural resources too quickly, and at the same time we are 49 our environment with dangerous chemicals. If we continue to do this, human life on the earth 50 survive.
Everyone 51 today that if too many fish are taken from the sea, there will soon be none left. Yet, with modern fishing 52 , more and more fish are caught. We know that if too many trees are cut down, 53 will disappear and nothing will grow on the land. Yet, we 54 to use bigger and more powerful machines to 55 more and more trees.
We realize that if rivers are polluted with waste products from factories, we will die. 56 , in most countries wastes are 57 put into rivers or into the sea, and there are 58 laws to stop this. We know, too, that if the 59 of the world continues to rise at the present rate, in a few years there will not be enough 60 . What can we do to solve these problems ?
If we eat more vegetables and less 61 , there will be more food available for everyone. Land that is used to grow crops 62 five times more people than land where animals are kept. Our natural resources will 63 longer if we learn to recycle them. The world population will not rise so quickly if people use modern methods of birth 64 .
Finally, if we educate people to think about the problems, we shall have a better and clearer 65 in the future.
| 【小題1】 | | A．beautiful | B．unlimited | C．rare | D．valuable |
|
| 【小題2】 | | A．common | B．the same | C．changeable | D．different |
|
| 【小題3】 | | A．crowded | B．small | C．dirty | D．busy |
|
| 【小題4】 | | A．protecting | B．saving | C．polluting | D．fighting |
|
| 【小題5】 | | A．may not | B．will not | C．shall not | D．could not |
|
| 【小題6】 | | A．wonders | B．realizes | C．consider | D．discovers |
|
| 【小題7】 | | A．poles | B．boats | C．methods | D．ideas |
|
【小題8】A mountains B. the sea C. trees D. forests
| 【小題9】 | | A．continue | B．have | C．ought | D．go on |
|
| 【小題10】 | | A．grow | B．plant | C．save | D．cut down |
|
| 【小題11】 | | A．Thus | B．However | | C．Generally speaking | D．Therefore |
|
| 【小題12】 | | A．still | B．even | C．a(chǎn)lso | D．certainly |
|
| 【小題13】 | | A．too many | B．a(chǎn) few | C．some | D．few |
|
| 【小題14】 | | A．production | B．pollution | C．population | D．revolution |
|
| 【小題15】 | | A．houses | B．vegetables | C．food | D．lives |
|
| 【小題16】 | | A．fruit | B．meat | C．fish | D．grain |
|
| 【小題17】 | | A．feeds | B．increases | C．supplies | D．helps |
|
| 【小題19】 | | A．control | B．born | C．plan | D．reward |
|
| 【小題20】 | | A．nature | B．sea | C．planet | D．forest |
|
