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、Where dry and humid air masses meet. B、Where the air becomes warm and humid. C、When thunderstorms or tornadoes occur. D、When t
A、Where dry and humid air masses meet. B、Where the air becomes warm and humid. C、When thunderstorms or tornadoes occur. D、When t
admin
2014-05-30
16
问题
The winds of a tornado are the most violent and destructive ones on Earth. Any of you who have seen one knows very well how frightening and powerful they are. What’s interesting about them is that scientists don’t actually know exactly why tornadoes occur.
We do know, however, what happens when tornadoes are formed. As you remember, a front occurs when cool, dry air from the north meets warm, humid air coming from the south. Where these air masses meet, a narrow zone of storm clouds develops, and thunderstorms, and sometimes tornadoes, occur.
How is this violent weather produced? Well, a mass of warm, humid air rises very rapidly. As it rises, more warm air rushes in to replace it. This inrushing air also rises, and in some cases, especially when there is extreme thermal instability, begins to rotate. When this happens, the rotating air forms a tornado.
Even if you’ve seen tornadoes only in movies, you know that they can destroy buildings in seconds. This is possible because when a tornado passes over a house, it sucks up air from around the house and so the air pressure outside the house drops rapidly. Inside, pressure remains the same. So, air pressure inside is greater than air pressure outside. The result is that the building explodes outward. Next,, we’ll talk a little bit about how new technological developments are being used to try to predict tornadoes.
16. What does the speaker say about the scientists?
17. In what way does a narrow zone of storm clouds develop?
18. What will happen to a building when air pressure inside is greater than outside?
选项
A、Where dry and humid air masses meet.
B、Where the air becomes warm and humid.
C、When thunderstorms or tornadoes occur.
D、When the air rises very rapidly.
答案
A
解析
原文提及“当来自北方寒冷干燥的空气与来自南方温暖湿润的空气相遇,锋面形成。当这些气团相遇,一个狭窄的暴风云区也形成。”故A正确。
转载请注明原文地址:https://kaotiyun.com/show/Sv17777K
0
大学英语六级
相关试题推荐
DrugshavebeenapartoftheAmericanstorysincetheveryfirstdayColumbuslandedintheNewWorld.TheTainoIndians【B1】___
DrugshavebeenapartoftheAmericanstorysincetheveryfirstdayColumbuslandedintheNewWorld.TheTainoIndians【B1】___
A、PromisingdrugswillsoonstopAIDS.B、ThespreadofAIDScouldbecontrolled.C、ItishopelesstowinthebattleagainstAIDS
Culturalrulesdetermineeveryaspectoffoodconsumption.Whoeatstogetherdefinessocialunits.Forexample,insomesocietie
A、Towriteabusinessletter.B、Toprovideproofofthedeal.C、Tofindoutthemistakesofaletter.D、Tofinishreadingthele
Forthispart,youareallowed30minutestowriteashortessayentitledShouldRetirementAgeBeRaised?Youshouldwriteatl
ShouldWeEmbraceCyberspeak?1.越来越多的网络用语渗透到日常口语和书面语中2.有人认为这是语言发展的结果,也有人认为这是对语言的污染3.我的看法
AfterSusanJoycewaslaidofffromDigitalEquipmentCorp.,shewashorrifiedtohearoftwosuicidesinherlayoffgroup.Such
A、Theman’scompanyhassomedifficulties.B、Theman’scompanyisgoingbankrupt.C、Theman’scompanyisarrangingatravel.D、T
Bloggingisapastimeformany,evenalivelihoodforafew.Forsome,itbecomesan【B1】______.Suchbloggersoftenfeelcompell
随机试题
某网上商城因为业务发展,原有的系统不能很好的满足需要,因此采用了一套新的经营管理系统,此系统使用SQLServer2008数据库管理系统。此系统上线运行前,需将商场原有的数据导入到新系统中。原有系统使用SQLServer2000,数据结构与新系统不
Thepeopletherewillpaytwoorthreetimesasmuchastheyusedtopayforahouse.
我国自行发掘的,具有高效、速效、低毒的新型抗疟药是()
男性,50岁。因反复呕吐5天人院,血清钠108mmol/L,脉搏1207欠/分,血压70/50mmHg。应诊断为
治疗蛔虫病肠虫证的首选方剂是
《建设工程安全生产管理条例》建设单位不得
某公路工程项目可行性研究报告的相关资料和基础数据如下:(1)项目工程费用为2000万元,工程建设其他费用为500万元(其中无形资产费用为200万元),基本预备费费率为8%,预计未来3年的年均投资价格上涨率为5%。(2)项目建设前期年限为1年,建设期为2
秦某有一中巴,经有关部门批准,秦某跑起了自北京市区至郊区某线路的短途运输业务。某日,秦某在超速驾驶中,为避免与李某的客车相撞,紧急刹车致乘客钱某的物品毁损。经查,钱尚未买车票,则钱某损失秦某应否赔偿?()
下列属于劳动合同必备条款的是()。
光盘存储器可分成三种类型,其中可擦写型光盘采用的是______可重写技术。
最新回复
(
0
)