首页
登录
职称英语
Trees are useful to man in three important ways: they provide him with wood
Trees are useful to man in three important ways: they provide him with wood
游客
2024-01-18
56
管理
问题
Trees are useful to man in three important ways: they provide him with wood and other products; they give 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. (78)
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 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 all 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 it grew weak. When the empire fell to pieces; the home country found itself faced with floods and starvation. [br] Why does land become desert after all trees are cut down?
选项
A、Because nothing remains on land except floods.
B、Because there are no longer trees to keep the rain and protect the top-soil.
C、Because too much rain sinks in and washes away the top-soil.
D、Because roots of the trees break up the soil.
答案
B
解析
第二段最后一句话提到当顶层土壤被冲走,就只剩下沙漠。而土被冲走是因为没有森林保存雨水,所以选B。
转载请注明原文地址:http://tihaiku.com/zcyy/3373444.html
相关试题推荐
Themostimportant________ofhisspeechwasthatweshouldallworkwhole-hear
Theconnectionbetweenreadingandwritingisastrongandimportantone,【C1
Theconnectionbetweenreadingandwritingisastrongandimportantone,【C1
Theconnectionbetweenreadingandwritingisastrongandimportantone,【C1
Theconnectionbetweenreadingandwritingisastrongandimportantone,【C1
Theconnectionbetweenreadingandwritingisastrongandimportantone,【C1
Thisinstrumentis______thatone.A、almostasusefulthanB、asalmostusefulasC
Toplayfairisasimportantas.A、weplaywellB、playingwellC、toplaywellD、
你知道今天报上有一篇重要的文章吗?Doyouknowthatthereisanimportantarticleintoday’snews
(Itis)(extremely)important(for)anengineer(toknow)touseacomputer.A、It
随机试题
Theexperienceofforeigncountriesisworthlearningfromandtakingforrefere
PASSAGETHREE[br]Whatdoes"Baedeker"mostprobablymean?Atravelinghandbook.
Thosetwinsaresoalikethatitisnexttoimpossibletodistinguish______.A、w
对不存在活跃市场的投资品种进行基金资产估值,说法正确的是()。 Ⅰ.应釆取在
下列并非常见理财规划工具的是()。A:股票 B:法律 C:保险 D:子女激
A. B.2 C. D.0
经计算液化指数IIE,场地液化等级为严重,正确的抗震措施为()。 A.乙、丙
(2018年真题)中国江苏龙叔公司与意大利图歌公司签订DAT(南京)的合同进口一
设计单位应当就审查合格的施工图设计文件向()作出详细说明。A.建设单位
互感器的主要功能有()。A.使仪表和继电器标准化 B.提高仪表及继电器的绝缘
最新回复
(
0
)