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>> 成人高等教育 / 计算机组装与维护
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阅读理解：阅读下列短文，回答文后问题，选择最佳答案Trees mainly serve man in three important ways: They provide him with wood and other products; they provide him shade; and they help to prevent droughts and floods.Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important．In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear.This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil allowing the rain to sink in and also bind(固定) the soil, thus preventing it from being washed away easily；but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When the top-soil is gone, nothing remains but worthless desert.Two thousand years ago，a rich and powerful country cut down its trees to build warships, with which to gain itself an empire．It set up the empire, but, without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation(饥荒)．4. Why did the country mentioned in the passage suffer from floods and starvations? A、 A. Because it set up an empire. B、 B. Because it fell to pieces. C、 C. Because it turned its trees into warships. D、 D. Because it spent too much money on wars.大学英语1 竖向受压荷载下，单桩的刺入破坏
（ ）。 土力学与地基基础 关于基膜内褶哪项错误？ 组织胚胎学 （ ）是专门从事货物配送活动的流通企业，其设施和设备都比较齐全。 仓储与配送管理 等距抽样属于 应用文写作 下列选项中那个不是沈从文的作品？ 大学语文