登录
五、完形填空。〔人与自然——自然生态〕
Others have always warned us of the dangers of forest fires. They cause __1__ to a forest. They kill many plants and animals in an ecosystem, which is a group of living things and their environment. But have you ever heard of a forest fire that can be __2__ for a forest? People start some of the fires with a(n) __3__ reason to actually do good to the ecosystem.
__4__, fires are a natural part of any ecosystem. Without fires, the oldest and largest trees would stop __5__ from getting to the forest floor. Fires can __6__ some of these old trees. When the trees die, they provide __7__ good for the earth. New trees can grow strong and healthy in their places.
Some trees even need fires to __8__. These trees hold their seeds inside. Heat from a fire allows the coat of the seeds to open up. Then the seeds fall to the ground and have the __9__ to grow.
Scientists, who know about nature's need, start some of these fires, called controlled burns. A fire is started and kept under control. This way, the fire doesn't spread out of the area or __10__ a large space of the forest. Fires can be __11__ for animals. Even __12__ animals continue to live after forest fires, they can go hungry because the fire has damaged their food. Small, controlled fires mean that animals will not have to move far to find food. After some time, small plants begin to grow. Animals return soon after the plants return. This __13__ makes an ecosystem.
Next time you hear about a forest fire, think about the good __14__ the bad. It may __15__ a new ecosystem a while to return, but it will probably come back, stronger and healthier than ever.
1. A. illnessB. difficultyC. damageD. rubbish
2. A. helpfulB. specialC. badD. powerful
3. A. commonB. importantC. interestingD. unusual
4. A. In orderB. In factC. In returnD. In general
5. A. heatB. warmC. coolD. sunlight
6. A. replaceB. fightC. removeD. increase
7. A. anythingB. somethingC. nothingD. none
8. A. burnB. balanceC. growD. create
9. A. timeB. waterC. chanceD. energy
10. A. hideB. coverC. leaveD. waste
11. A. satisfyingB. helplessC. dangerousD. necessary
12. A. whenB. whileC. sinceD. as
13. A. almost B. even C. never D. again
14. A. as good as B. as harmful as C. as well as D. as useful as
15. A. spend B. take C. pay D. cost
Others have always warned us of the dangers of forest fires. They cause __1__ to a forest. They kill many plants and animals in an ecosystem, which is a group of living things and their environment. But have you ever heard of a forest fire that can be __2__ for a forest? People start some of the fires with a(n) __3__ reason to actually do good to the ecosystem.
__4__, fires are a natural part of any ecosystem. Without fires, the oldest and largest trees would stop __5__ from getting to the forest floor. Fires can __6__ some of these old trees. When the trees die, they provide __7__ good for the earth. New trees can grow strong and healthy in their places.
Some trees even need fires to __8__. These trees hold their seeds inside. Heat from a fire allows the coat of the seeds to open up. Then the seeds fall to the ground and have the __9__ to grow.
Scientists, who know about nature's need, start some of these fires, called controlled burns. A fire is started and kept under control. This way, the fire doesn't spread out of the area or __10__ a large space of the forest. Fires can be __11__ for animals. Even __12__ animals continue to live after forest fires, they can go hungry because the fire has damaged their food. Small, controlled fires mean that animals will not have to move far to find food. After some time, small plants begin to grow. Animals return soon after the plants return. This __13__ makes an ecosystem.
Next time you hear about a forest fire, think about the good __14__ the bad. It may __15__ a new ecosystem a while to return, but it will probably come back, stronger and healthier than ever.
1. A. illnessB. difficultyC. damageD. rubbish
2. A. helpfulB. specialC. badD. powerful
3. A. commonB. importantC. interestingD. unusual
4. A. In orderB. In factC. In returnD. In general
5. A. heatB. warmC. coolD. sunlight
6. A. replaceB. fightC. removeD. increase
7. A. anythingB. somethingC. nothingD. none
8. A. burnB. balanceC. growD. create
9. A. timeB. waterC. chanceD. energy
10. A. hideB. coverC. leaveD. waste
11. A. satisfyingB. helplessC. dangerousD. necessary
12. A. whenB. whileC. sinceD. as
13. A. almost B. even C. never D. again
14. A. as good as B. as harmful as C. as well as D. as useful as
15. A. spend B. take C. pay D. cost
答案
1. C 2. A 3. D 4. B 5. D 6. C 7. B 8. C 9. C 10. B 11. C 12. A 13. D 14. C 15. B
