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
Fighting Against Water For centuries Dutch engineers have been fighting a war against water. Their main enemy is the sea. A
Fighting Against Water For centuries Dutch engineers have been fighting a war against water. Their main enemy is the sea. A
admin
2017-05-31
31
问题
Fighting Against Water
For centuries Dutch engineers have been fighting a war against water. Their main enemy is the sea. A large part of the country is below sea level. In fact, Holland is also called the "Netherlands" which means "low land". Very tall and strong walls, called dykes, have built to keep out the sea. But in very rough weather the sea may suddenly burst through a dyke. Great damage can be caused by floods when this happens.
Three large rivers are also part of the problem. These rivers are the Rhine, the Maas and the Scheldt. They flow through Holland into the North Sea. They have cut many passages across the country. At low tides, the rivers flow into the sea as usual. But at high tide, the sea can flow into the rivers! This is because the land is so low.
The battles against the water never end, but they have made Holland a bigger and bigger country. In order to prevent floods, the engineers take, or reclaim land that was under water. The Dutch have been reclaiming land for seven hundred years.
Land is usually reclaimed from a passage between islands. Two dykes are built across the passage, so they block the water between them. Then the engineers dig long canals and pump the water into them. At low tide, the canals empty the water into the sea.
Because the land is so low, water from the sea and rivers can rise up through the ground. For this reason, the pumps continue working even the land has been drained(that is, when the water has been pumped away). The dykes contain gates, and through these the water is pumped out. In many parts of Holland, pumps must be working all the time. If they stopped, there will be very bad floods.
A piece of reclaimed land is called polder, and Holland has thousands of polders. Some are very large, but others are quite small. There are farms on many of the polders. Corn and other crops grow well on the drained land, and it gives good grass for cattle. Many small towns and villages stand on polders. Even Amsterdam’s great airport, Schiphol, was built on reclaimed land. This land used to be under the old Lake Haarlem.
Holland is threatened not only by the sea, but also by______.
选项
A、the floods from broken dykes
B、the three rivers
C、the sea tides
D、many passages the three rivers have cut across the country
答案
B
解析
转载请注明原文地址:https://jikaoti.com/ti/fVKGFFFM
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
Asustainabletransportationsystemisonethatissafe,capableandfriendlytotheenvironment.Sustainabletransportationis
______peoplecanspeakaforeignlanguageperfectly.
Moreandmorestudentswanttostudyin"hot"majors.【C1】______aresult,manystudentswantto【C2】______theirinterestsandstu
Moreandmorestudentswanttostudyin"hot"majors.【C1】______aresult,manystudentswantto【C2】______theirinterestsandstu
WomenintheUnitedStatesandmanyothercountries【C1】______inagrowingnumberofsportsandgames.ManyAmericanwomenare【C2
Solittle______aboutmathsthatthelecturewascompletelybeyondme.
Meetingboysissometimeseasy,sometimesdifficult,butineithercase,itisonlythebeginning.Manygirlstryalltheapproa
Anewstudyshowsanastonishingnumberofpeopleareusingtheircellphonesonthejohn(盥洗室).Fromwebbrowsingandtextingto
我提议咱们会后马上去办公室找史密斯教授,邀请他参加我们的英语晚会。
Astonishingasitmightseem,we______one-fifthlessfoodthanwewereinthe1970s.
随机试题
海关事务担保
A.分解菊糖B.胆汁溶菌试验阳性C.两者均是D.两者均不是甲型溶血性链球菌()
A、龋齿B、牙龈炎C、牙周疾病D、牙列不齐E、前牙外伤小学生牙周问题主要是
中间综合征常发生在有机磷中毒后
关于社会懈怠的说法,错误的是()。
在我国法律体系中,居于核心地位、具有最高法律效力的是()。
土地革命战争时期,毛泽东指出:“一国之内,在四周白色政权的包围中,有一小块或若干块红色政权的区域长期地存在,这是世界各国从来没有的事。这种奇事的发生,有其独特的原因。”红色政权能够存在和发展的主观原因和条件是
设y1(x),y2(x)为y′+P(x)y=Q(x)的特解,又py1(x)+2qy2(x)为y′+P(x)y=0的解,py1(x)一qy2(x)为y′+P(x)y=Q(x)的解,则p=__________,q=____________.
假设现在要创建一个Web应用框架,基于此框架能够创建不同的具体Web应用,比如博客、新闻网站和网上商店等;并可以为每个Web应用创建不同的主题样式,如浅色或深色等。这一业务需求的类图设计适合采用_______(1)模式(如下图所示)。其中_______(2
Whatdoyouneedtodoinordertounderstandthelecture?NowtherearefourthingsthatI’mgoingtotalkabout.Thefirstthi
最新回复
(
0
)