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
61
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
SecretE-Scores[A]Americansareobsessedwiththeirscores.Creditscores,G.P.A.’s,SAT’s,bloodpressureandcholesterol(
Somesayitisevidentthatcomputerscandamageaperson’seyesight.Sincethepopularityofcomputersbegantoskyrocket,ther
Somesayitisevidentthatcomputerscandamageaperson’seyesight.Sincethepopularityofcomputersbegantoskyrocket,ther
Peoplehavewonderedforalongtimehowtheirpersonalitiesandbehaviorsareformed.It’snoteasytoexplainwhyonepersoni
Oncetheydecidedtohavechildren,MiShelandCarlMeissnertackledthenextbigissue:Shouldtheytrytohaveagirl?Itwas
Wesometimesthinkhumansareuniquelyvulnerabletoanxiety,butstressseemstoaffecttheimmunedefensesofloweranimalsto
Aristotledefinedafriendas"asinglesouldwellingintwobodies".MembersofFacebookwhose"friends"reachtriplefiguresm
Onelunchtime,MayWardwasdoinghershoppinginalocalsupermarket,whenshesuddenlyslippedandfell.Shewasbadlyshaken
Moneycanbuyhappiness,butonlyifyouspenditonsomeoneelse,researchersreported.Spendingaslittleas$5adayons
A、Boyshavethesameintelligenceasthemostintelligentgirls.B、Boyshaveagreatadvantageinthetestofverbalreasoning.
随机试题
《关山月》中表现朝廷对恢复中原态度诗句的一项是()
男性,32岁,周期性上腹痛3年,空腹发作,夜间更重,进食可缓解。最可能的诊断为
软土地基处理的方法包括()等。
记账凭证式会计部门的内部凭证,可由()会同有关人员商定其传递程序和时间
税务机关按照()的原则,核发《外出经营活动税收管理证明》,《外出经营活动税收管理证明》的有效期限一般为30日,最长不得超过180天。
用人单位依法向劳动者支付经济补偿的,应当在()时支付。
给定资料1.2015年国务院政府工作报告提出,坚持主动作为,狠抓落实,切实做到勤政为民。经济发展进入新常态,精神面貌要有新状态。广大公务员特别是领导干部要始终把为人民谋发展增福祉作为最大责任,始终把现代化建设使命扛在肩上,始终把群众冷暖忧乐放在心
一个单周期处理器,各主要功能单元的操作时间为:指令存储器和数据存储器为0.3ns,ALU为0.2ns,寄存器文件为0.1ns,则该CPU的时钟周期最少应该是()。
某大学有位女教师默默资助一位偏远山区的贫困家庭长达15年,记者多方打听,发现做好事者是该大学传媒学院甲、乙、丙、丁、戊5位教师中的一位。在接受采访时,5位老师都很谦虚,他们是这么对记者说的:甲:这件事是乙做的。乙:我没有做,是丙做了这件事。丙:我并没
TalkingtoKidsaboutSARS(非典)SchoolagechildrenmaybelearningaboutSARSfromadultsandthemedia,butmaynotknowwh
最新回复
(
0
)