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
66
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://kaotiyun.com/show/RrXC777K
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
Myfriends______usintogoingswimming.
Accordingtocurrent【C1】______,theworld’spopulation,whichisdoublingevery35years,willbeatornear14billion【C2】____
Heseems______tounderstandthesimplestinstruction.
Calmdownandgiveusan______accountofthewholeaccident.
Hetalksasifhe______everythingintheworld.
ResearchershavefoundthatREM(rapideyemovement)sleepisimportanttohumanbeings.Thistypeofsleepgenerallyoccursfour
Modernsciencehasgivenclearevidence______smokingcanleadtomanydiseases.
Educatinggirlsquitepossiblyyieldsahigherrateofreturnthananyotherinvestmentavailableinthedevelopingworld.Women
Hemusthaveheardofthebadnews,_______canbeperceivedinhisexpression.
Thesesurveysindicatethatmanycrimesgo______bythepolice,mainlybecausenotallvictimsreportthem.
随机试题
女,75岁,右大腿卵圆窝部反复出现圆形包块10年。此次因便秘包块突出,用力还纳后右下腹持续疼痛伴呕吐就诊。查体:下腹压痛,肌紧张,叩诊肝浊音界缩小,肠鸣音消失。对诊断最有帮助的首选检查是
法洛四联症的4种病理变化中最重要的是
等直杆的受力情况如图5-1所示,则杆内最大轴力FNmax和最小轴力FNmin分别为()。
图4一1—13所示平面构架,不计各杆自重。已知:物块M重Fp,悬挂如图所示,不计小滑轮D的尺寸与重量,A、E、C均为光滑铰链,L1=1.5m,L2=2m。则支座B的约束力为()。[2013年真题]
某化工企业,液氨罐区发生了泄漏事故,已经造成了人员死亡,下列不属于该企业在事故应急救援阶段的基本任务的是()。
郑老师在教学过程中习惯根据教学要求提出相应问题,然后要求学生回答,并通过问答的形式来引导学生获取或巩固知识,郑老师所用的教学方法属于()。
全球粮食价格上涨,我国作为拥有众多人口的发展中大国,也在一定程度上受到影响。国家采取一系列措施确保粮食安全,包括()。
①据此,洪堡提出了青藏高原“热岛效应”理论 ②这不符合常理 ③早在18世纪末,德国科学家洪堡就发现,赤道附近的高山雪线,比中纬度的青藏高原许多高山的雪线低200米左右 ④故其热量较同纬度、同海拔高度的其他地区高得多,甚至比赤道附近的同海拔地区也
第一个表达文艺复兴教育思想的人是
以下程序的输出结果是_________。#include<stdio.h#defineFUDGE(y)2.84+y#definePR(A)printf("%d",(int)(A))#definePRINT1
最新回复
(
0
)