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
专升本
On a rainy day, you will see many streams of muddy(多泥的) water running down the slopes(斜坡) of a hill. The water is muddy because
On a rainy day, you will see many streams of muddy(多泥的) water running down the slopes(斜坡) of a hill. The water is muddy because
admin
2018-04-17
25
问题
On a rainy day, you will see many streams of muddy(多泥的) water running down the slopes(斜坡) of a hill. The water is muddy because it washes away soil from the hill slopes.
Sometimes soil is blown away by strong winds. When the soil is carried away by water or wind, we say that the land is eroded (侵蚀). This is known as soil erosion.
Plants cannot grow on eroded land. There is not enough soil on eroded land to give them the things they need. Plants need water and salts from the soil.
We can do a number of things to stop soil erosion. This is called soil conservation(保护).
One way of soil conservation on flat, open ground is to grow small plants such as grasses. Their roots hold the soil tightly together.
Another way is to plant trees around an open field. Thus soil erosion by strong winds cannot take place. Rows of trees act as a very big wall.
Soil erosion on slopes can be stopped by cutting "steps" called terraces(梯田). Water carrying soil cannot run straight down the slope now. It has to run down the terraces. This slows down the flow(流速) of the water. Most of the soil in the water is left behind on the terraces.
There are some other ways for soil conservation.
The way of soil conservation on flat, open ground is______.
选项
A、to grow small plants such as grasses
B、to plant trees around an open field
C、to add fertilizer to the soil
D、A and B
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/uKiC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Whenallthepeoplehadassembled,theking,surroundedbyhiscourt,【C1】______asignal.Thenadoorbeneathhimopened,andt
Alittleboyinvitedhismothertoattendhisschool’sfirstteacher-parentmeeting.Tothelittleboy’s【21】,shesaidshewould
Pickoutfiveappropriateexpressionsfromtheeightchoicesbelowanticompletethefollowingdialoguebyblackeningthecorres
Dannywasjusttiredaboutthewaythingsweregoing.HismomcametotheschoolandwentonandonaboutRickJackson.Itseeme
EveryyearjustafterChristmastheJanuarySalesstart.Alltheshopsreducetheirpricesandfortwoweeks,theyarefullofp
EveryyearjustafterChristmastheJanuarySalesstart.Alltheshopsreducetheirpricesandfortwoweeks,theyarefullofp
Beforethe1870’s,trainednurseswerevirtuallyunknownintheUnitedStates.Hospitalnursingwasanunskilledoccupation,tak
SpeakerA:Whatasurprise!Youchangedyourhairstyle.SpeakerB:Yes,andanothersurprise,I’mgoingtogetmarriednextSat
FrankLloydWrightprobablyisthegreatestarchitectthattheUnitedStateshaseverproduced.Hewasvery【21】andhadanatural
A.Whatkindofmusicdoyoulike?B.Shallwehavesomethingtoeat?C.Seeyoulater.D.Doyouknowif/whetherthereisares
随机试题
微分方程y’’+y=一2x的通解为().
金属基托的缺点是
患儿,1天来暴泻不止,症见大便稀溏如水样,面色苍白,哭声微弱,四肢厥冷,冷汗自出,尿少。其辨证属于
室内消火栓管道安装时,若管道壁厚≤4mm,直径≤50mm,应采用()
按照《公司法》的规定,普通股股东不享有()的股东权益。
简述沃辛瘤的临床特点。
远期利率隐含在即期利率中,并且是利用即期利率套算出来的。()
微分方程y’’一λ2y=eλx+e-λx(λ>0)的特解形式为()
x、y、x均为int型变量,描述“x、y和z中至少有两个为正数”的表达式是______。
Aginghappenstoallofus,andisgenerallythoughtofasanaturalpartoflife.Itwouldseemsillytocallsuchathinga"d
最新回复
(
0
)