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
2012-04-05
47
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 19 to 22 are based on the conversation you have just heard.
19. What is the main topic of the discussion?
20. What does the professor ask the student to explain?
21. According to the professor, how do earthquakes cause turbidity currents?
22. 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,该题可能考查做某事的目的。本题应锁定对话末尾,概括对话最后的Then it’s just like the winds blowing across the desert可知,答案为A)。
转载请注明原文地址:https://kaotiyun.com/show/jFf7777K
0
大学英语四级
相关试题推荐
Forthispart,youareallowedthirtyminutestowriteonthetopic"TheSignificanceofChallenge".Youshouldwriteatleast
DuringMcDonald’searlyyearsFrenchfriesweremadefromscratcheveryday.RussetBurbankpotatoeswere【C1】______,cutintosh
Recentstoriesinthenewspapersandmagazinessuggestthatteachingandresearchcontradicteachother,thatresearchplaystoo
Careeristsarepeoplewhoseself-imageisdeterminedalmostexclusivelybytheirjobs.【B1】______everythingtheydoisdesignedt
Americanseat___________(两倍的)proteinastheyactuallyneedeveryday.
A、ThedifferencesbetweenBritishEnglishandAmericanEnglish.B、ThesimilaritiesbetweenBritishEnglishandAmericanEnglish.
A、Australia.B、NewZealand:C、ThePhilippines.D、TheUnitedStates.A这道题的答案已在对话中直接给出。男士问女士是否来自澳大利亚,女士给出了肯定的回答。B)、C)、D)虽然都在对话中提
A、Earlierthismonth.B、Octoberof2003.C、Lastyear.D、Earlierthisyear.A细节题。浏览选项可知,本题考的是时间,听录音时对此要特别用心,并且在选项旁做好相应的标记。文中关键句子
HenryIIIdidn’tknowmuchaboutbiology.Hewentthroughsixwivesbackinthe1500s,lookingforonewhocouldbearhimason.
随机试题
下列不属于有效控制的原则的是()
椎体结核呈囊状破坏,周围见薄层硬化环,随诊病情稳定,提示病变内组织成分主要是:
严重的低渗性缺水可补给
心肌梗死时最先出现的症状是
价值比率法中的市盈率倍数法主要适用于( )的评估。
教师在组织语言教育活动时,必须坚持教师示范与儿童练习相结合的原则。()
互联网旅游金融服务是指旅游业依托互联网工具,实现资金融通、支付和信息中介等业务的一种新兴金融服务。未来,互联网旅游金融服务也更具有优势。以下哪项如果为真,最能支持上述观点?
求函数的导数:y=ef(x).f(ex),其中f(x)具有一阶导数.
设a1,a2,…,an是一组n维向量,证明它们线性无关的充分必要条件是任一n维向量都可由它们线性表示。
To:NeilGrossmanFrom:AudreyStanfordDate:August8Subject:OrderofTilesDearMr.Grossman,Thisisconcerningyourrecen
最新回复
(
0
)