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>> 成人高等教育 / 微观经济学（MOOC）
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佳题速递：
下列选项中，哪一项是定义类的关键字（ ） C++程序设计 与别人谈话需要注意哪些礼节？ 旅游社交礼仪 A向B发盘，称欲以每公吨1000美元的价格购买某商品2000公吨，发盘中同时规定，若B方三日内不答复则是为同意。根据《联合国国际货物销售合同公约》的规定，如果B方三日内不答复，则双方合同成立。（ ） 国际贸易实务 道德建设的核心体现并决定着道德建设的根本性质和发展方向，规定着道德领域的种种道德现象。我国社会主义道德建设的核心是( )。 思想道德修养与法律基础 文字素材的属性包括（ ）。 多媒体技术基础及应用 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