题目内容
Most forest fires are caused by human carelessness, negligence, or ignorance. Forest fire prevention, therefore, is mainly a problem of creating a better understanding of the importance of forests, an awareness of the danger of fire in the woods, and a sense of personal responsibility to safeguard the forests from danger. This is not an easy job. A city dweller, used to paved street, does not easily change his smoking habits when he goes into the woods.
Careless smokers are responsible for thousands of forest fires each year. Many of these are started when cigarette butts and matches are tossed from automobiles. Others are caused by hunters, hikers, fishermen, or woods workers who are careless in disposing of their smoking material. The Forest Service has posted rules in many of the National Forests that prohibit smoking except in certain designated areas. Many of the states have laws against throwing lighted materials from automobiles. The prevention of smoker-caused fires, however, depends upon changing the attitudes and behavior of millions of people who smoke in hazardous area.
The most important natural cause of fire is lightning. This accounts for 11 percent of forest fires on protected land for the entire nation. In the western states, lightning causes a much higher percentage of fire than it does in the east.
Advances in knowledge of fire weather are helping forest protection forces to know when to be alert for lightning-caused fires. Adequate and well-equipped forces can control them quickly and hold the damage to a minimum. Experiments in “seeding” thunder clouds to prevent or control the lightning itself have been in process for many years, but new breakthroughs are needed for any significant reduction in the lightning starts.
1. The passage is chiefly about
A. smoking in forests
B. the chief cause of forest fire and their prevention
C. changing the attitudes and behavior of millions of people
D. advances in knowledge of fire weather
2. Preventing smoker-caused forest fires is mainly a problem of——.
A. building the proper knowledge and habits in human beings
B. safeguarding the forest from fire
C. posting rules in forests
D. holding the damage to minimum
3. Lightning-caused fires can be controlled quickly by——.
A. hunters and woods workers B. responsible smokers
C. adequate and well-equipped forces D changing people's habits
4. Which of the following statements is not true?
A. The chief causes of forest fires are human carelessness, negligence, or ignorance.
B. Lightning, the important natural cause of forest fire, can be prevented or controlled by men.
C. Quite a few states in America have laws against throwing lighted materials from automobiles.
D. “Seeding” thunder clouds are a good way to prevent forest fire.
解析：
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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 |
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 |