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
A、How Aswan Dam Was Built. B、How Holland Solved Its Drainage Problem. C、Transporting with Canal Boats. D、Canals and Their Uses.
A、How Aswan Dam Was Built. B、How Holland Solved Its Drainage Problem. C、Transporting with Canal Boats. D、Canals and Their Uses.
admin
2010-06-11
34
问题
Today, most countries in the world have canals. Even in the 20th century, goods can be moved more cheaply by boat that any other means of transport. Some canals such as the Suez or the Panama, save ships weeks of time by making their voyage a thousand miles shorter. Other canals permit boats to reach cities that are not located on the coast. Still other canals drain lands where there is too much water, help to irrigate fields where there is not enough water.
In places where it does not rain very often, irrigation canals drain water from rivers or lakes such as the lake behind the Aswan Dam on the Nile River, and provide the irrigation water.
In places where there is too much water, canals can drain the water off the land for use in fanning. In Holland, acres and acres of land have been drained in this way. Since much of this drained land is below sea level, the water in the canals has to be pumped up to sea level. Dikes have been built in Holland to keep the sea from covering the land, as it did in the past.
Canals are also used to carry water to mills and factories. The water from a river is kept at a higher level than the river until it reaches the wheel of the mill. Then the water is poured over un61 it reaches the wheel of the mill. Then the water is poured over the mill wheel, making it turn. The same principle is used in more modern factories and in hydroelectric generating plants. The force of the water, falling from a certain height, provides a cheap way of producing electricity.
选项
A、How Aswan Dam Was Built.
B、How Holland Solved Its Drainage Problem.
C、Transporting with Canal Boats.
D、Canals and Their Uses.
答案
D
解析
转载请注明原文地址:https://jikaoti.com/ti/CIMMFFFM
0
大学英语六级
相关试题推荐
A、Theopeningupofnewmarkets.B、Theprintingofhighqualitycopies.C、TheincreaseduseoftheInternet.D、Therapiddevelop
Mostpeoplewouldbe【S1】bythehighqualityofmedicine【S2】tomostAmericans.Thereisalotofspecialization,agreatdeal
A、Theycandobetterthanothers.B、Itisexpensivetohirelabour.C、Theydon’tliketobehelped.D、Theydon’ttrustothers.B
A、Maderiawasnotchosenbecauseitsroadsweretoodangerous.B、TheCostaDelSolwasfinallychosenafterthreemonthsofinve
HowWindEnergyWorksHarnessingthewindisoneofthecleanest,mostsustainablewaystogenerateelectricity.Windpower
HowWindEnergyWorksHarnessingthewindisoneofthecleanest,mostsustainablewaystogenerateelectricity.Windpower
HowWindEnergyWorksHarnessingthewindisoneofthecleanest,mostsustainablewaystogenerateelectricity.Windpower
A、Bigwavesposeathreattocommercialnavigation.B、Therivercurrentneverflowsfastertenmilesperhour.C、Theriverrever
随机试题
石决明药材的原动物属于
下列哪类肺癌对放疗最为敏感?()
国务院银行业监督管理机构根据履行职责的需要设立派出机构,下列关于派出机构的说法正确的是:()
不属于问卷设计的内容是()。
下列不属于理财师的客户来源的是()。
某企业为增值税一般纳税人,主要生产甲、乙两种产品,适用增值税税率为17%,消费税税率为8%,2004年3月份有关会计资料如下:(1)销售甲产品1000件,每件不含税价格为800元,同时负责运输并收取运输费1000元。(2)将甲产品50件用于职工福利,已
百折不挠:坚忍不拔
联想的发展历程联想集团有限公司成立于1984年,由中国科学院计算技术研究所投资20万元人民币、联合11名科技人员创办,当时称为“中国科学院计算所新技术发展公司”。1989年,成立“北京联想计算机集团公司”。2011年起成为全球第二大个人电脑生产商
环境被污染,使人类越来越重视环境问题,这是因为()。
滑冰,亦称“冰嬉”(iceplay)。早在宋代,我国就已经有了滑冰运动,不过,那时不叫滑冰,而称之为“冰嬉”。“冰嬉”包括速度滑冰、花样滑冰以及冰上杂技(acrobaticskating)等多种项目。滑冰运动不仅能够增强人体的平衡能力和柔韧性,同时还有
最新回复
(
0
)