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 the sea with great force. B、By reducing wave energy. C、By reducing beach width. D、By stabili
A、By sending water directly back to the sea with great force. B、By reducing wave energy. C、By reducing beach width. D、By stabili
admin
2013-10-28
33
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 when it returns to the sea as 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.
Questions 33 to 35 are based on the passage you have just heard.
33. Why do communities build seawalls?
34. How does a gently-sloping beach help prevent erosion?
35. What do the geologists advise people to do?
选项
A、By sending water directly back to the sea with great force.
B、By reducing wave energy.
C、By reducing beach width.
D、By stabilizing beachfront construction.
答案
B
解析
选项均以By+现在分词开头表明,本题可能考查做某事的方式。由短中提到的If the flow of the beaches is gentle, the water energy is lessened as it washes up along the shore可知,一个稍有斜度的海滩可以减少波浪的能量,从而有助于阻止侵蚀,故答案为[B]。
转载请注明原文地址:https://kaotiyun.com/show/Ec27777K
0
大学英语六级
相关试题推荐
Mountainclimbingisbecomingapopularsport,butitisalsoa【B1】_____dangerousone.Peoplecanfall;theymayalsobecomeil
A、Silentreadinghadnotbeendiscovered.B、Therewerefewplacesavailableforprivatereading.C、Fewpeoplecouldreadforthe
A、Establishpersonalcontracts.B、Furtherpersonalcontacts.C、Investigatepersonalcontracts.D、Sellmedicalfacilities.B推理判断题
A、Onethird.B、Almosttwothirds.C、Morethantwothirds.D、Almosthalf.B文中提到,根据调查,63%的美国成年人没有8个小时的睡眠时间,这8个小时是健康身体、安全优良工作表现所需要的
CertainphrasesonecommonlyhearsamongAmericanscapturetheirdevotiontoindividualism:"Doyourownthing.""Ididitmywa
A、Themanwillprobablyhavetofindaroommate.B、Themanisunlikelytoliveinthesuburbs.C、Themanwillprobablyhavetob
Everyculturehasitsownbodylanguage,andchildrenabsorbitsnuancesalongwiththespokenlanguage.AFrenchmantalksandm
Ofallthelessonstaughtbythefinancialcrisis,themostpersonalhasbeenthatAmericansaren’ttooslickwithmoney.Wetak
A、Separatingthefire.B、Reducingtheheat.C、Removingthefuel.D、Cuttingofftheoxygen.D选项表明,本题与火灾的预防或扑灭有关。由短文可知,fuel“燃料”、ox
A、Alotofgoodpublicity.B、Talentedartiststoworkforit.C、Long-terminvestments.D、Adecreaseinproductioncosts.A事实细节题。
随机试题
《中国药典》2010年版采用什么方法检查游离肼
一项病例对照研究,500名病例中有暴露史者400例,而500名对照中有暴露史者100例,其OR值为()。
按供水用途,给水系统可分为()。
图(a)所示电路中,运算放大器输出电压的极限值+UOM。当输入电压ui1=1V,ui2=2sinωtV时,输出电压波形如图(b)所示,那么,如果将ui1从1V调至1.5V,将会使输出电压的()。
下列项目中,计征企业所得税时不允许扣除的项目有( )。
某设计院有甲、乙、丙三个部门,甲部门的员工数等于乙、丙部门员工数之和,而三个部门员工总数恰好男女相等,已知甲部门的男员工数是乙部门女员工数的2倍,是丙部门男员工数的3倍,则丙部门的男女员工比例为()。
对被调查人采取留置措施后,应当在()小时以内,通知被留置人员所在单位和家属,但有可能毁灭、伪造证据,干扰证人作证或者串供等有碍调查情形的除外。
量子理论和相对论一起构成了现代物理学的基础.它们对人类产生的重大影响有:①描绘了一个崭新的宏观宇宙世界和微观世界②开阔了人们的视野③改变了人们看世界的角度和方式④为现代科技革命奠定了基础
科尔伯格采用()研究儿童的道德认知发展
假定有如下的Sub过程:SubS(xAsSingle,yAsSingle)t=xx=t/yy=tModyEndSub在窗体上画一个命令按钮,然后编写如下事件过程:Pr
最新回复
(
0
)