首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Trees are useful to man in three important ways: they provide him with wood and other products; they give him shade; and they he
Trees are useful to man in three important ways: they provide him with wood and other products; they give him shade; and they he
admin
2018-02-03
85
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. 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 oh 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.
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
事实细节题。第二段最后一句话提到当顶屋土壤被冲走,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:https://kaotiyun.com/show/M0CO777K
0
成人本科学位英语
相关试题推荐
Whenpeopletalk,theykeepacertain______fromsomeonetheytalkwith.
Manythings______almostimpossibleintheancienttimesareverycommontoday.
Nomatterwhoyouareorwhereyoucomefrom,onethingiscertain:youareacquaintedwiththemosquito(蚊子)—althoughyouprobab
Thespeakercouldhardlyfindsafeground______hisarguments.
SpeakerA:I’mterriblysorryforbeingsocareless.SpeakerB:________
Nowadaysmostpeopledecidequiteearlywhatkindofworktheywoulddo.WhenIwasatschool,wehadtochoose【C1】______whenwe
Standardusageincludesthosewordsandexpressionsunderstood,used,andacceptedbyamajorityofthespeakersofalanguagei
Liz:Geez!Yourroomislikeanice-box!Terri:【D1】______It’sjustcomfortable.Liz:Yeah,ifyou’reapenguin.Justlookatm
Zoe:Geez!Yourroomislikeanice-box!Terry:【D1】______It’sjustcomfortable.Zoe:Yeah,ifyou’reapenguin.Justlookatme
随机试题
(2010.4.多选)1905年8月,中国同盟会制定的革命纲领是()
早期宫颈癌最有价值的诊断方法是()
计算机能直接执行的程序是( )。
对弱光敏感的细胞是()。
斯腾伯格认为在智力成分中,起核心作用的是()
社会建设与人民幸福健康息息相关。胡锦涛总书记在党的十七大报告中提出,要加快推进以()为重点的社会建设。
左边给定的是纸盒的外表面,下面哪一项能由它折叠而成?
人吃的精制糖以及消化后分解为糖的食物是血液中几乎所有葡萄糖的来源。然而,虽然咖啡在消化过程中并不分解为糖,但有时候也可以使人体内的血糖浓度急剧上升,尽管咖啡中并没有加奶油或其他甜味剂。下面哪一项如果正确,最有助于解释咖啡对血糖浓度的作用?
一个教师讲授多门课程,一门课程由多个教师讲授。则实体教师和课程间的联系是
______(我们一得出这个结论)thantheyagreedtoit.
最新回复
(
0
)