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>> 国家开放大学 / 行政组织学
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佳题速递：
Something must have happened on their way. Or they _ _ _ _ _
by now. 学位英语 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)．3. Land becomes desert after all trees are cut down because _ _ _ _ _ _ _ _ _ _ . A、 A. roots of trees break up the soil B、 B. no tree keeps the rain and protects the top-soil C、 C. strong winds bring a lot of sand D、 D. there are too many rainfalls to make it 大学英语1 责任意识系指谈判参与者对谈判决策实施责任的（ ）。a.意愿b.100%理解c.监督d.认可e.%-商务谈判实务 结构的使用年限超过设计使用年限后（ ）。 A、 可靠度降低 B、 可靠度增加 C、 可靠度不变 D、 结构丧失其功能混凝土结构设计原理 若在产量不变的情况下，每增加1个单位劳动的投入可以减少2个单位资本的投入，则资本对劳动的边际技术替代率是（） 经济学基础 【单项选择题】以下各组范畴属于“自律”与“他律”关系的是（ ）。
行政伦理学