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、Protecting roads along the shore. B、Building on beaches with seawalls. C、Adding sand to beaches with seawalls. D、Stopping buil
A、Protecting roads along the shore. B、Building on beaches with seawalls. C、Adding sand to beaches with seawalls. D、Stopping buil
admin
2009-04-23
50
问题
Your professor has asked me to talk to you today about the topic that should be of real concern to civil engineers: the erosion of the US beaches. Let me start with some statistics, Did you know that 90% of the coast in this country is eroding, on the gulf of Mexico for instance, erosion averages 4 to 5 feet per year? Over the past 20 years, there has been an increase in building along the coast, even though geologists and environmentalists have been warning communities about problems like erosion. Someway, communities have tried to protect their buildings and roads and to build seawalls. However, geologists have found that such stabilizing structures actually speed up the destruction of the beaches. These beaches with seawalls, called stabilized beaches, are much narrower than beaches without them. You may wonder how seawalls speed up beach loss. The explanation is simple. If the flow of the beaches is gentle, the water energy is lessened as it washes up along the shore. It is reduced even more that returns to the sea so it doesn’t carry back much sand. On the other hand, when the water hits the nearly vertical face of the seawall, it goes straight back to the sea with the full force of its energy and it carries back a great deal of sand. Because of the real risk of losing beaches, many geologists support a ban on all types of stabilizing construction on shorelines.
选项
A、Protecting roads along the shore.
B、Building on beaches with seawalls.
C、Adding sand to beaches with seawalls.
D、Stopping building seawalls.
答案
D
解析
What do the geologists advise people to do?
转载请注明原文地址:https://kaotiyun.com/show/EqZK777K
0
大学英语六级
相关试题推荐
Thehumanbraincontains10thousandmillioncellsandeachofthesemayhaveathousandconnections.Suchenormousnumbersused
Thusfar,thereislittleevidencetosuggestthattechnologywillreduceinequality;indeeditmayonlyintensifyinequality.T
Itdoespayyoutoberespectfultootherpeople.
DREAMWORLDINFORMATIONHOURSOFOPERATION:Dreamworldisopeneverydayoftheyearfrom10:00a.m.to5:00p.m.,except
Manycountriesfaceasomewhatmoreseriouseconomicproblemsintheformofanunfavorabletradebalance(贸易逆差)withothernati
Thebusinesscycleismadeupofmanyphasesandoneofthemistheexpansionphasewhichisdividedintotwoparts—recoveryand
Whydomoremiddle-agedadultshavetotakecareoftheirageingparents?Becausepeopleareliving______.
Howhardisittogetbeautifulhair?Beautifulhaircannotbetakenforgranted.Environmentalfactors,chemicaltreatments
INFORMATIONSECURITYSPECIALISTNOTE:Pleasesubmityourresumedirectlythroughthiswebsite,aswellasemailingyourresu
随机试题
情感当中经常谈到的“爱国主义情感,班集体荣誉感,同学友谊感……"都属于()。
电动潜油泵井正常运行时电流卡片,呈()。
T.S.Eliot’searlypoemsaremarkedby______incomparisontohislaterones.
A、拇指不能外展B、“虎口”区皮肤感觉消失C、伸拇、伸指关节障碍D、伸腕障碍E、拇指不能内收患者,男,20岁。右桡骨茎突部位刀砍伤,引起桡神经浅支损伤。查体时可发现()
房屋租赁的租金应受市场的调节和制约。()
城镇民用炊事炉灶、茶浴炉以及产热量在()以下采暖炉应禁止燃用原煤,提倡使用电、燃气等清洁能源或固硫型煤等低污染燃料,并应同时配套高效炉具。
下列关于格迪斯学说的表述,错误的是()。
水压试验时,二氧化碳灭火器钢瓶的残余变形率不得大于()。
以下属于人力资源需求预测的定量方法的是()。
Inthe19thcentury,theinventionofthetelegraphandthetelephoneforeverchangedhowmessagesmovedaroundtheworld.Inth
最新回复
(
0
)