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 very important ways: they provide him with wood and other products; they give him shade; and th
Trees are useful to man in three very important ways: they provide him with wood and other products; they give him shade; and th
admin
2011-01-14
20
问题
Trees are useful to man in three very important ways: they provide him with wood and other products; they give him shade; and they help to prevent droughts (干旱) and floods.
Unfortunately, man has not realized that the third of these services is the most important. Two thousand years ago a rich and powerful country cut down its trees to build warships, with which to gain itself an empire (帝国). It gained the empire, but, without its trees, its soil became hard and poor. When the empire fell to pieces, the home country found itself threatened by flood and starvation.
Even though a government realizes the importance of a plentiful supply of trees, it is difficult for it to persuade villagers to see this.
The villagers want wood to cook their food with; and they can earn money by selling wood. They are usually too lazy to plant and look after the trees.
So, unless the government has a good system of control, or can educate the people, the forests will slowly disappear.
This does not only mean that the villagers’ children and grandchildren will have fewer trees. The results are even more serious, for where there are trees their roots break the soil up, allowing the rain to sink in, and also bind the soil, thus preventing its being washed a-way easily. But where there are no trees, the rain falls on hard ground and flows away from the surface, causing flood.
The role of trees is to______.
选项
A、loosen soil
B、keep soil in position
C、harden soil
D、both A and B
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/xCJO777K
0
成人本科学位英语
相关试题推荐
Itisdifficulttoimaginewhatlifewouldbelikewithoutmemory.Themeaningsofthousandsofeverydayperceptions,thebases【
Anotherimportantfactor______inchoosingtheplaceistheavailabilityofcoalinamplequantities.
ItisoftenrealizedthatwomenheldahighplaceinsouthernEuropeansocietiesinthe10thand11thcenturies.Asawife,the
ItisoftenrealizedthatwomenheldahighplaceinsouthernEuropeansocietiesinthe10thand11thcenturies.Asawife,the
ThreeYaleUniversityprofessorsagreedinapaneldiscussiontonightthattheautomobilewaswhatoneofthemcalled"PublicHe
ThreeYaleUniversityprofessorsagreedinapaneldiscussiontonightthattheautomobilewaswhatoneofthemcalled"PublicHe
Itisonethingtoenjoylisteningtogoodmusic,butitisquite______toperformskillfullyyourself.
Goandseeforyourself,andyou______whatbesaidistrue.
Opinionpollsarenowbeginningtoshowanunwillinggeneralagreementthat,whoeveristoblameandwhateverhappensfromnowo
就住房状况而言,他更喜欢农村而不是城市。
随机试题
Manyofhisnovelsarereported______intoseveralforeignlanguageslastyear.
首先创用活血利水法治疗瘀血水肿的古籍是()
苦参碱属于哪类生物碱
从甲、乙两文中,查到同类研究的两个率的比较的四格表资料经x2检验,甲文x2>x20.01(1),乙文x2>x20.05(1),可认为()。
关于基金销售机构从业人员规范,下列说法错误的是()。
下列关于有限合伙企业的说法正确的有()。
招标人应当按照()确定中标人。
我国于()年对《义务教育法》做了最新修订。
生理pH条件下,下列哪种氨基酸带正电荷
Whichofthefollowingmightbethebesttitleforthepassage?Theword"candor"inthethirdsentenceofthethirdparagraph
最新回复
(
0
)