首页
登录
职称英语
For centuries Dutch engineers have been fighting a war against water. Their m
For centuries Dutch engineers have been fighting a war against water. Their m
游客
2024-01-16
22
管理
问题
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. 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. 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 was built on reclaimed land. [br] 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 low tides and high tides
D、many passages of the rivers
答案
B
解析
细节判断题。第二段开头提到:Three large rivers are also part of the problem(三条大的河也是一个问题),所以选B。选项D中说到河流的分支,这是属于三条大河所造成的问题,不能作为本题的选项。
转载请注明原文地址:https://tihaiku.com/zcyy/3367831.html
相关试题推荐
Yourcomments______myworkhaveprovedtobehelpful.A、inB、forC、onD、against
Sheleaned______thewallwhileshewasspeakingtoherfriend.A、toB、againstC
Saltisasnecessarytolifeaswater.InmanyareasofAfricapeopleonced
Saltisasnecessarytolifeaswater.InmanyareasofAfricapeopleonced
Saltisasnecessarytolifeaswater.InmanyareasofAfricapeopleonced
Saltisasnecessarytolifeaswater.InmanyareasofAfricapeopleonced
Saltisasnecessarytolifeaswater.InmanyareasofAfricapeopleonced
Saltisasnecessarytolifeaswater.InmanyareasofAfricapeopleonced
Saltisasnecessarytolifeaswater.InmanyareasofAfricapeopleonced
Someanimalscan______inthedesertonverylittlewater.A、surviveB、starveC、re
随机试题
[originaltext]W:Goodmorning,LeightonUniversityLibrary.HowcanIhelpy
[originaltext]Moderator:Hello,ladiesandgentlemen.Itgivesmegreatp
Sometwentyyearsago,theperformanceofgirlsandboysinclasswascompar
智能建筑电源与接地包括()分项。A.功能分区 B.智能建筑电源 C.实时数据
人失去对三维空间各种物体远近、前后、高低、深浅和凹凸的一种感知能力,称为()A.
下列用药属于过度治疗的是A.应用两种或两种以上一药多名的药物 B.轻度感染给予
采用统计分析法制定出的劳动定额称为( )。A.实耗定额B.加法劳动实际定额C.
人在每一瞬间,将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的(
患者,女,67岁,入院后行左侧髋关节置换术,术前12小时皮下注射低分子肝素预防深
下颌的功能运动是指( )。A.边缘运动 B.叩齿运动 C.开闭口运动 D
最新回复
(
0
)