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
In some countries in which there is very little rain at any time, the farmers have to water their fields. Irrigation is easy eno
In some countries in which there is very little rain at any time, the farmers have to water their fields. Irrigation is easy eno
admin
2009-03-15
53
问题
In some countries in which there is very little rain at any time, the farmers have to water their fields. Irrigation is easy enough if there is a great river near the crops and if there is plenty of water in it. Canals(运河) carry the river water to the fields when necessary. In some seasons there may be too much water in the river, and the water may flood all the land near it. At other times the river water may not be enough for all the farmers, and then it will be difficult to irrigate the fields.
To prevent these difficulties, a dam (大坝) may be built across the river. This will store water for dry seasons and in wet seasons it will prevent the flooding of the land. A great lake will, no doubt, be formed behind the dam, and this may mean that houses and fields will be covered with water. Most people will accept that and will be ready to move to other places. Then the country can have the right amount of water at all times; more crops will be growing, there will be more food for everyone, and there will be no more floods.
Dams have been built for centuries in different parts of the world. Modern dams are usually built of concrete(混凝土) ,but earth dams were used in India and Sri Lanka about 2,500 years ago. There was another across the River Tigris very long ago, and large numbers of irrigation canals were made in Iraq to irrigate the land. The Romans were great dam-builders and there was also a famous dam at Ma’rubin Arabia.
选项
A、the problems caused by river water
B、the necessity to irrigate the field
C、the water shortage in some countries
D、the canals carrying water to fields
答案
A
解析
第一段主要讲述了河水造成的困难:水太多会淹没土地,水太少又会使耕地干旱。
转载请注明原文地址:https://kaotiyun.com/show/SdAd777K
本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
0
公共英语二级笔试
公共英语(PETS)
相关试题推荐
Whendoyouthinkthisconversationtookplace?
Readthetextbelow.Writeanessayinabout120words,inwhichyoushouldsummarizethekeypointsofthetextandmakecommen
Oneinsix.Believeitornot,that’sthenumberofAmericanswhostrugglewithhunger.Tomaketomorrowalittlebetter,Feedin
SugarcanewasonceawildgrassthatgrewinNewGuineaandwasusedbylocalpeopleforroofingtheirhousesandfencingtheir
It’sthefirstquestionparentsaskwhentheirchildisdiagnosedwithautism(自闭症).Willhisfuturebrothersorsistershavea
SugarcanewasonceawildgrassthatgrewinNewGuineaandwasusedbylocalpeopleforroofingtheirhousesandfencingtheir
ItwasfifteenpastnineasMariehurriedintotheofficebuildingwhereshewasgoingtowork.Herbushadinchedalongthrough
ItwasfifteenpastnineasMariehurriedintotheofficebuildingwhereshewasgoingtowork.Herbushadinchedalongthrough
ItwasfifteenpastnineasMariehurriedintotheofficebuildingwhereshewasgoingtowork.Herbushadinchedalongthrough
rolesheplayedinthefilm!NowondershehaswonanOscar.
随机试题
经常采用压料方式放料的反应器是()。
FarmerEdRawlingssmilesashelooksathisorangetrees.TheyoungorangesaregrowingwellinFlorida’sweather.Warmsunshin
肝细胞性黄疸患者伴随症状常有
下列各项关于投资性房地产计提折旧或摊销的表述中正确的有()。
某工业企业职工共30人,企业的资产总额为300万元,上年亏损52万元,2019年企业有关生产、经营资料如下:(1)取得产品销售收入230万元、国债利息收入23万元,金融债券利息收入39万元。(2)发生产品销售成本100万元;发生产品销售税金及附加5.6
我国自主研制的综合技术处于国际领先水平计算机系统于2014年6月23日以每秒33.86千万亿次的浮点运算速度获得世界超算“三连冠”。它是()。
扩张性货币政策主要指()。
一个民族的建筑有它自己的构造规则或组合方式,如同语言的“文法”。中国建筑就具有特殊的“文法”。我们的祖先在选择了木料之后逐渐了解了木料的特长,创始了骨架结构初步方法——中国系统的“梁架”。这以后他们发现了木料性能上的弱点。当水平的梁枋将重量转移到
作为一名大学毕业生,如果能够具备较扎实的专业知识和基本的社会交往能力,或者是在就业市场上能够作出适合自己的选择,那么,就不可能找不到自己的位置。小王是一名大学毕业生。他没有找到工作职位,那么根据上述观点能够推出以下哪项结论?
Imagineeatingeverythingdeliciousyouwant—withnoneofthefat.Thatwouldbegreat,wouldn’tit?New"fakefat"products
最新回复
(
0
)