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
2013-01-20
88
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,本题考查做某事的目的。由对话中提到的Then it’s just like the winds blowing across the desert picking up sand...moving it...dropping it somewhere else可知,是将turbidity currents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/chu7777K
0
大学英语四级
相关试题推荐
WestPointisacollegeforfutureArmyofficers.Ithasmorethan4000studentscalledcadets(军校学员).Theschoolis【B1】______
Justlikechildren,deeroftencrossBritishroadstogettotheotherside.Butthecostisthedeer’slife.Atnight,【S1】____
A、At6,10.B、At6:30.C、At6:40.D、At7:00.D细节推断题。女士说他们应该抓紧时间,否则就赶不上开幕式了;男士劝女士不用担心,因为现在才六点半,半个小时内一定能赶到。由此可以推断,开幕式七点开始。
MexicoPutsItsChildrenonaDietMexicoputsitsschoolchildrenonadietatthebeginningoftheyear.Butasoftenhappe
Some23millionadditionalU.S.residentsareexpectedtobecomemoreregularusersoftheU.S.healthcaresysteminthenexts
OpinionpollsrepeatedlytellusthattheonlythingAmericansworryaboutmorethantheenvironmentistheirhealth.Thisis【C1
A、HeprefersGermanytootherEuropeancountries.B、Hepreferslargenoteswhentraveling.C、He’drathertaketraveler’schecks
Atsometimeinyourlifeyoumayhaveastrongdesiretodosomethingstrangeorterrible.【C1】______.chancesarethatyoudon
A、Thebacteriawouldbekilledbythehumanimmunesystem.B、Thebacteriawoulddieifbroughttothesurface.C、Manyantidotes
随机试题
在人员绩效考评过程中,要多方收集被考核对象的信息,对其进行综合性考评,这种做法体现了人员绩效考评的【 】
Somepeoplefinditdifficultto______(success)inEnglishlanguagelearning.
带状疱疹西医治疗不宜选用的是:
行胎头吸引术的产妇预防产后出血的护理措施中最重要的是( )。
覃朗和袁美丽在国庆节结婚,覃朗驾驶着奔驰600去接亲。在接亲回来的途中。覃朗行驶至花丽小区南3号楼下时,突然有一花盆从楼上坠下,将挡风玻璃砸碎,袁美丽的脸部被划伤。后经调查得知。花盆是从该楼502房间的阳台上掉落。覃朗和业主马胡交涉,马胡矢口否认,于是袁美
工程建设标准根据约束性的不同可分为()。
背景资料某一储油库工程,施工图纸已齐备,现场已完成三通一平工作,满足了工程开工的条件。该工程由银行贷款和企业自筹资金相结合,解决了资金问题,实行邀请招标发包。业主与承包单位签订的合同总工期为10个月,计300个日历天,按国家工期定额规定
一般来说,招标文件可分为________。
若保持同比增长率不变,预计哪一年4月入境旅游的法国游客人数将会超过英国?()
下列有关模板的叙述中,正确的是()。
最新回复
(
0
)