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、To explain the effects of turbidity currents. B、To explain how winds cause turbidity currents. C、To remind the student about t
A、To explain the effects of turbidity currents. B、To explain how winds cause turbidity currents. C、To remind the student about t
admin
2020-03-30
28
问题
W: Dr. Smith. I need to ask you about something in Chapter 12. Well, it talks about erosion and the deposit of sediment(solid matter that settles at the bottom of a liquid)on the deep sea floor, but I’m confused. For that to happen, there would have to be some kind of force down there moving the mud or sand or whatever, right? But I thought there weren’t any waves or currents that deep in the ocean.
M: That’s not exactly correct. It’s true that deep down on the ocean floor we won’t have the same kinds of currents we find in shallower parts. But we do find what we call turbidity currents. That wasn’t in the book but the term came up in class. Do you remember what it means?
W: Um, turbidity currents? Oh, yeah! Isn’t that when sediment like sand or mud gets stirred up and mixes with water? And then this mixture flows through the water around it, right?
M: Good!
W: Uh, but I thought that only happened in rivers.
M: Well, yes. This does occur in rivers, but we see turbidity currents deep in the ocean as well.
W: But how do they get started there?
M: Earthquakes mostly. When an earthquake occurs under water, it throws up tremendous amounts of mud or sand that becomes suspended in a layer of water near the bottom of the ocean. This layer is so much denser and heavier than other ocean water that it flows right down the slopes of the ocean floor and gains more and more speed as it moves along. Then it’s just like the winds blowing across the desert picking up sand from one place and moving it along and finally dropping it somewhere else.
Questions 9 to 12 are based on the conversation you have just heard.
9. What is the main topic of the discussion?
10. What does the professor ask the student to explain?
11. According to the professor, how do earthquakes cause turbidity currents?
12. Why does the professor mention desert winds?
选项
A、To explain the effects of turbidity currents.
B、To explain how winds cause turbidity currents.
C、To remind the student about the next assignment.
D、To remind the student where ocean sediments originate.
答案
A
解析
选项均以“To+原形动词”开头表明,本题考查做某事的目的。由对话中提到的Then it’s just likethe winds blowing across the desert picking up sand…Moving it…dropping it somewhere else可知,是将turbiditycurrents的作用与desert winds作用进行类比,答案为A)。
转载请注明原文地址:https://kaotiyun.com/show/CId7777K
0
大学英语四级
相关试题推荐
Don’tletvacationsorbusinesstravelsideline(使退出)yourexerciseroutine.Physicalactivityisagreatwayto【C1】______stress
A、Astudentandateacher.B、Thesecretaryandtheboss.C、Asalesgirlandacustomer.D、Thewifeandthehusband.B根据对话中用的Mr.和M
A、Theyareusuallyadoptedfromdistantplaces.B、Theirbirthinformationisusuallykeptsecret.C、Theirbirthparentsoftentr
TopicOnCelebritiesAcceptedbyUniversitiesForthispart,youareallowed30minutestowriteashortessayentitledOnCe
UniversitiesBranchOutA)Asneverbeforeintheirlonghistory,universitieshavebecomeinstrumentsofnationalcompetitio
A、Thirtycentsaday.B、Thirteencentsaday.C、Thirtycentsfourday.D、Twenty-threecentsaday.A信息明示题。当女士问如果发生了没有及时还书的情况会罚多少
A、Thedevelopmentofelectronicmusicalinstruments.B、Therelativecostsofdifferenttypesofmusicalinstruments.C、Theperfo
A、Bicycleraces.B、Standingontraintracks.C、Fallingfromhighplaces.D、Dangeroussports.C
A、TourEcuador’sAndesMountains.B、Earnanannualincomeof$2,800.C、Purchaseaplottobuildahomeon.D、Sendtheirchildren
A、Chemicals.B、Vapour.C、Water.D、Gas.D细节题。短文开头明确提到,干冰是通过将气体直接冷冻形成的(byfreezingagas),可见干冰是用gas制成的,故答案为D)。
随机试题
关于施工企业项目经理地位的说法,正确的是()。
根据《中华人民共和国民事诉讼法》,下列人员中,应当适用回避制度的有()。
患者,男,恒牙牙合,上牙弓轻度拥挤,右上侧切牙舌向错位,间隙不足,采用不拔牙矫治方案在右上尖牙和右上中切牙之间放置螺旋推簧扩展间隙如果使用方丝弓矫治器,为达到右上侧切牙的控根目的,最好采取的措施是
呆小症的原因是
在供给量中应包括()。
在应用动态控制原理控制建设工程项目目标时,调整项目组织结构、管理职能分工属于()措施。
食品业和公用事业属于()
下列说法中错误的是()。
下面关于青海气候描述正确的是()。
Whichofthefollowingsentencesispossibletoarouseambiguity?
最新回复
(
0
)