-
-
>> 成人高等教育 / 计算机导论
-
佳题速递：
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 选择药品供应商的标准不包括( )。 医药商品营销实务 31、小说《红楼梦》里的林黛玉是典型的（ ）气质。 普通心理学 How long does the trip took? 大学英语（本）1 判断组织兴奋性高低常用的指标是阈电位。 生理学 若资本的边际效率高于市场利息率，则表示现有投资规模偏小。 微观经济学（MOOC）