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
2017-09-04
23
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/eeiC777K
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
Doweneedlawsthatpreventusfromrunningriskswithourlives?Ifso,thenperhapslawsareneededprohibitingthesaleofc
ShehadchangedsomuchthatIcouldhardly,______her.
ShehadchangedsomuchthatIcouldhardly______her.
Duringthesummersessionthesewillbearevisedscheduleofservicesfortheuniversitycommunity.Specificchangesforinterc
BecauseofthefastpaceofAmericanlife,manyfamiliescannoteattogetheraroundthefamilytableeveryevening.Manypeople
I’dlikebuyahouse—modern,comfortable,and______inaquietneighborhood.
Hewasmade______hisworkingbecauseofhispoorhealth.
Sixtypercentoftelevisionviewerschosehimastheir______actor.
Thesalesmanapproachedthehousevery______becausetherewasadogatthegate.
随机试题
体内酸性物质积聚或产生过多,或HCO3-丢失过多为()
30岁已婚女性,公司职员,发现明显消瘦2个月,近1个月进食增多,并感觉疲乏,常有心慌,怕热多汗,易激动而住院
治疗寒湿凝滞型痛经的最佳方剂是治疗湿热下注型痛经的最佳方剂是
患者,女,55岁。平素头晕耳鸣,腰膝酸软,突发口眼歪斜,言语不利,手指动,舌红,脉弦细数。其治法为
我国现行宪法第一条规定:“中华人民共和国是工人阶级领导的、以工农联盟为基础的人民民主专政的社会主义国家。”从性质上说属于下列选项中的哪一类?()
根据《行政许可法》的规定,下列不属于行政许可必须遵守的原则是()。
取得导游人员资格证的,经(),方可向省、自治区、直辖市人民政府旅游行政部门领取导游证。
均衡国民收入等于()。
美的东西都是相对的,随着人们对现实的审美关系的变化而变化,当美的东西与人处在某种关系当中,它是美的;处在另外的关系当中,它就可能不美或是另一种美。例如西湖,当晴光潋滟或是山雨空前的时候,条件不同,它就具有不同的美。当时杜甫写到:“好雨知时节,当春乃发生。随
求函数f(x)=在区间[e,e2]上的最大值.
最新回复
(
0
)