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、By sending water directly back to sea with great force. B、By reducing wave energy. C、By reducing beach width. D、By stabilizing
A、By sending water directly back to sea with great force. B、By reducing wave energy. C、By reducing beach width. D、By stabilizing
admin
2019-10-03
145
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. Some way communities have tried to protect their building and roads and to build seawalls. However geologists have found that such stabilizing structures actually speed up to the destruction of the beaches. These beaches with seawalls, called stabilized beaches, are much narrower than beaches without them. U 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 hit 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 the shore lines.
Now listen to the following recording and answer questions 22 to 25.
22. What is the speaker mainly discussing?
23. Why do communities build seawalls?
24. How does a gently sloping beach help prevent erosion?
25. What would the speaker probably advise engineers to do?
选项
A、By sending water directly back to sea with great force.
B、By reducing wave energy.
C、By reducing beach width.
D、By stabilizing beachfront construction.
答案
B
解析
细节题。根据If the flow of the beaches is gentle,the water energy is lessened as it washes up along the shore.可知稍微倾斜的海滩能减少水能,以此来防止侵蚀。因此,正确答案为B。
转载请注明原文地址:https://kaotiyun.com/show/H0W7777K
0
大学英语六级
相关试题推荐
Intheworldofentertainment,TVtalkshowshaveundoubtedlyfloodedeveryinchofspaceondaytimetelevision.Andanyonewho
Atattoomaygiveparentsofchildrenwithfoodallergiessomepeaceofmindwhentheysendtheirkidsofftoschool.Yes,atat
TheMysteryoftheNazcaLines[A]IfyouvisitthePeruviancoastaldesertfromnorthtosouth,youwillnotethatsporadica
America’smostpopularnewspaperwebsitetodayannouncedthattheeraoffreeonlinejournalismisdrawingtoaclose.TheNewY
AgehasitsprivilegesinAmerica,andoneofthemoreprominentofthemistheseniorcitizendiscount.Anyonewhohasreached
AskmostpeoplehowtheydefinetheAmericanDreamandchancesarethey’llsay,"Success."Thedreamofindividualopportunityh
Theperiodofadolescence,i.e.,theperiodbetweenchildhoodandadulthood,maybelongorshort,dependingonsocialexpectati
Oncetheydecidedtohavechildren,MiShelandCarlMeissnertackledthenextbigissue:Shouldtheytrytohaveagirl?Itwas
ShoppricesinJunefellatthefastest【C1】______ratesinceatleast2006as【C2】______foughttoattractcustomers,theBritishR
A、Four.B、Fourteen.C、Five.D、Fifteen.A细节题。根据第四段第一句Birdfluhasalsoclaimedhumanlives.Fourpeoplediedofavianinfluenzain
随机试题
A.奔马律B.第一心音C.第二心音D.舒张期滚筒样杂音E.全舒张期递减型杂音韵律酷似马奔跑时马蹄触地发出的声音称为
A.低温干燥B.蒸透心,敞开低温干燥C.发汗后再晒干或烘干D.干燥过程中要时时搓揉,使皮、肉紧贴E.阴干玄参在采收加工时应()。
某女性病人,50岁。因腹痛、寒战高热、恶心呕吐及黄疸2天入院。查体:T40℃、P120次/分、R30次/分,BP90/50mmHg,表情淡漠,剑突下压痛明显,白细胞55.0×109/L,诊断为急性梗阻性化脓性胆管炎、休克。此病人属于哪一类休克
材料一(案情):孙某与村委会达成在该村采砂的协议,期限为5年。孙某向甲市乙县国土资源局申请采矿许可,该局向孙某发放采矿许可证,载明采矿的有效期为2年,至2015年10月20日止。2015年10月15日,乙县国土资源局通知孙某,根据甲市国土资源局日
随着不确定因素变化百分率取值的不同,()。
【背景资料】某中型防洪工程由政府投资兴建。项目法人委托某招标代理公司代理施工招标。招标代理公司依据有关规定确定该项目采用公开招标方式招标,招标公告在当地政府规定的招标信息网上发布,招标文件中规定:投标担保可采用投标保证金或投标保函方式。评标方法
审核凭证的目的是为了防止凭证填制过程错误发生和舞弊行为。记账凭证填制完毕后,必须由审核人员对制单员所填制的记账凭证进行审核方能登记入账。 ( )
下列属于期货市场在宏观经济中的作用的是()。
下列关于项目投资决策的表述中,正确的是()。(2009年新)
企业采取宽松的营运资本持有政策,产生的结果是()。
最新回复
(
0
)