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
49
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
Kathywasauniversitystudent.Likemoststudentsshehadverylittlemoney,butshewantedtobuyacar."IfIcanbuyon
Thedeclineinmoralstandards--whichhaslongconcernedsocialanalysts--hasatlastcapturedtheattentionofaverageAmerican
Thedeclineinmoralstandards--whichhaslongconcernedsocialanalysts--hasatlastcapturedtheattentionofaverageAmerican
Thereaxe【B1】______researchmethodsyoucanuseto【B2】______information.Asaresearcher,youcanchoosethemethodormethods
A、Thecitycanbealonelyplace.B、LifeintheWestcanbeverydangerous.C、PeopleintheWestarefondofanimals.D、Thedog
Forthispart,youareallowed30minutestowriteacompositiononthetopicChangesintheWayPeopleSpentHolidays.Youshou
A、Tothetheater.B、Toclass.C、Tothemovie.D、Totheoffice.B女士委婉地拒绝了男土的邀请,开说明了原因:因为要考试,她不得不去教室复习。故选B。
Theconflictsbuildthroughcomplication.Thetensionamountsascharacterstakeactiontosolve
A、Unfriendliness.B、Generosity.C、Friendship.D、Strength.D细节题。短文中提到inprimitivelifethehandwasprobablyasymbolofpoweran
Wehadn’trealizedthedifficultyofthisjob.It______tobeharderthanwehadthought.
随机试题
患者,男,60岁。肝癌晚期,极度衰弱。此时医护人员应采取的主要措施是
患儿4岁,咳嗽近一周,咳嗽痰多,稠黏难咳,伴发热面赤,口苦作渴,烦躁,查体:舌红苔黄脉滑。此病例应诊为
上颌磨牙桩冠修复时最可能利用的根管是
患者男,35岁,高处坠落后出现严重呼吸困难、四肢不能活动,查体:颈部压痛,四肢瘫痪,高热,有较重痰鸣音,X线摄片提示:C4~C5骨折,合并脱位。导致其呼吸困难的最主要原因为()
企业在计算持有现金总成本时,通常应考虑的因素有( )。
企业的营业成本包括()。
近年来,农民的收入水平不断上升,而支出占收入的比重持续上涨,这表示他们钱挣得越多,花得越多:相反,近年来城镇居民支出占收入的比重持续下降。所以,我们可以得出“农村居民比城市居民更敢花钱”的结论。以下选项如果为真,能够反驳上述结论的是()。
法理学的学习对法学初学者的具体意义和帮助包括()
RS-232C关于机械特性的要求,规定使用一个【 】根插针的标准连接器。
Electroniccommunication,duetoitsspeedandbroadcastingability,isfundamentallydifferentfrompaper-basedcommunications
最新回复
(
0
)