Choose the words or expressions and plete the passage (选择最恰当的单词或词语，完成短文)
1．We have always been warned of the dangers of the forest fires. They cause 1 to a forest. They kill many plants and animals in an eco-system, 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?
2．People start some of the fires with special reasons to actually do well to the eco-system.
3．In fact, fires are a natural part of any eco-system. Without fires, the oldest and largest trees would stop sunlight from reaching the forest floor. Fires can 3 some of these old trees. When the trees die, they provide something good for the earth. New trees can grow strong and healthy in their place.
4．Some trees even need fires to grow. These trees hold their seeds(种子) inside. Heats from a fire allow the coat of the seeds to open up. Then the seeds fall to the ground and have the 4 to grow.
5．Scientists, who know about nature’s needs, start some of these fires, called controlled burns. A fire is started and kept under control. This way, the fire does not spread out of the area or 5 a large space of the forest. Fires can be dangerous for animals. Even when animals continue to live after forest fires, they can go hungry 6 their food has been damaged in the fire. 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 7 makes an eco-system.
6．So the next time you hear about a forest fire, think about the good as well as the bad. It may take a new eco-system a while to return, but it will likely e back stronger and healthier than ever.
【小题1】A．illnessB．difficultyC．damageD．flood【小题2】A．helpfulB．powerfulC．harmfulD．awful【小题3】A．take the place ofB．get ready forC．be bad forD．get rid of【小题4】A．timeB．waterC．chanceD．skill【小题5】A．discoverB．coverC．butD．waste【小题6】A．becauseB．althoughC．butD．so【小题7】A．almostB．againC．neverD．evenC
网友回答
(答案→)C
解析：
【小题1】They cause to a forest. They kill many plants and animals in an eco-system.因为森林火灾杀死生态系统中的许许多多动物和植物，所以他们会引起毁灭性破坏。答案是cause damage。
【小题2】But have you ever heard of a forest fire that can be for a forest? People start some of the fires with a special reasons to actually do good to the eco-system.第一段讲森林火灾的危害，然后用but表示转折，另外第二段讲述do good to the eco-system森林火灾对生态系统带来的好处，所以选helpful有帮助的。
【小题3】Without fires, the oldest and largest trees would stop sunlight from reaching the forest floor. Fires can some of these old trees. When the trees die, they provide something good for the earth.第三段讲述了“没有林火，那么古老而高大的树会阻挡阳光，而林火恰恰能减少或者说弄掉这样的一些树，后面有讲这些树死了之后能为土壤提供营养。所以答案选get rid of除掉、摆脱
【小题4】Then the seeds fall to the ground and have the to grow. 第四段讲述了“有些树需要林火的帮助而生长，种子在火的热量的作用下破壳而出，然后这些种子才有生长的机会”。所以答案选chance。
【小题5】This way, the fire does not spread out of the area or a large space of the forest. 第五段讲述了“控制性燃烧的林火不会超越控制区域或占据很大的空间”，而新世纪英语中有这样的词组“cover an area of…占地面积…… ”，所以选cover。
【小题6】They can go hungry their food has been damaged in the fire.这题比较简单，因为食物在林火中遭受破坏，所以动物们要挨饿。所以选because。
【小题7】After some time, small plants begin to grow. Animals return soon after the plants return. This makes an eco-system.第五段最后讲述了“过了一段时间之后，在小的植物‘在春风吹又生’之后小动物也开始生长了的又一个生态系统开始了”，所以选答案again。