Stephen Hawking believes that the earth is unlikely to be the only planet life has developed gradually. A. that B. where C. which D. whose 题目和参考答案——青夏教育精英家教网—

题目内容

Stephen Hawking believes that the earth is unlikely to be the only planet______ life has developed gradually.

A. that B. where C. which D. whose

解析:

略

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Two thousand years ago a rich and powerful country cut down its trees to build warships, with which to gain itself an empire. It gained the empire but, without its trees, its soil became hard and poor. When the empire fell to pieces, the country found itself faced by floods and starvation.

Even though a government realizes the importance of a plentiful supply of trees, it is difficult for it to persuade the villager to see this. The villager wants wood to cook his food with, and he can earn money by making charcoal(木炭) or selling wood to the townsman（城市居民）. He is usually too lazy or too careless to plant and look after trees. So unless the government has a good system of control, or can educate the people, the forests will slowly disappear.

This does not only mean that the villager’s sons and grandsons have fewer trees. The results are even more serious. For where there are trees their roots break the soil up—allowing the rain to sink in and also hold the soil, thus preventing it being washed away easily, but where there are no trees, the soil becomes hard and poor. The rain falls on hard ground and flows away on the surface, causing floods and carrying away with it the rich topsoil, in which crops grow so well. When all the topsoil is gone, nothing remains but a worthless desert.

The purpose that the writer wrote this article is to ______.

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In the writer’s opinion, _____, or the forests will slowly disappear.

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