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、They are very frightening and powerful. B、They are interested in tornadoes. C、They all work very hard. D、They don’t know why t
A、They are very frightening and powerful. B、They are interested in tornadoes. C、They all work very hard. D、They don’t know why t
admin
2021-09-17
71
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.
In Britain, just after the main television news programmes, audience figures rise. It’s weather forecast time. The BBC broadcasts 44 live forecasts a day. 433 hours of weather a year, using forecasters from the Meteorological Office. The Met. Office makes predictions about the weather seven days in advance. These are based on observations from the ground, from satellites and from radar. The observations are stored in a computer that can do up to 4,000 million calculations a second.
9.What does the speaker say about the scientists?
10.In what way does a narrow zone of storm clouds develop?
11.What will happen to a building when air pressure inside is greater than outside?
选项
A、They are very frightening and powerful.
B、They are interested in tornadoes.
C、They all work very hard.
D、They don’t know why tornadoes occur.
答案
D
解析
原文提及“有趣的是,科学家并不清楚龙卷风具体是如何形成的。”故D正确。
转载请注明原文地址:https://kaotiyun.com/show/leD7777K
0
大学英语六级
相关试题推荐
TakingVacationsExperiencesan82PercentIncreaseinJobPerformanceA)Thistimeofyear,manyEuropeansarelookingforwardt
EatingDisordersA)Eatingdisordershavebeenmostcommonlyassociatedwithwomenandthereforemoststudiesonanorexianervosa
A、Therearenotenougheconomicopportunitiesforstudentsnotgoingtocollege.B、Schoolsfailtoeducatestudentsproperly.C、
A、ItiswidelyusedinAsia.B、Itletspeoplestandwhiletheywork.C、Itisanexercisemachine.D、ItisdesignedtowatchTVw
A、Studentslearnbestbydoingthingsforreal.B、StudentslearnfastinbusinessenvironmentC、Studentslearnfastthroughonli
TheUnitedStatesboaststhebestpublicuniversitiesintheworld.Noyoungpersonshouldbeturnedawaybecausetheywereborn
Onequestionthatworriesmanyvisitorstodefensivecarry.com,awebsitedevotedtothedelightsanddifficultiesoflifewitha
TheConservativegovernmentwillfacedifficultyprovingthatitsplantoautomaticallyenrolleligibleCanadiansintheOldAge
A、Interested.B、Indifferent.C、Suspicious.D、Negative.D女士建议男士选择坐游船去希腊或者土耳其旅行,男士说味道浓郁的食物不合自己的胃口,言下之意就是不接受这个建议,故选D。
A、Themandidn’tdieontheoperatingtable.B、Themanwentontolivefor20yearslater.C、Everyonecopiedhismethod.D、Many
随机试题
与妊娠中晚期腹痛无关的症状是
A.气管B.食管C.两者均是D.两者均否通过胸廓上口的是()
下列各项属于旅游定价目标中的利润目标的有()。
下列不属于社会和文化环境的因素是()。
“人们对真理的认识就像登山运动员登山一样,每登高一步,就接近顶峰一步。与登山不同的是,人们永远不可能达到真理的顶峰。”对这句话分析正确的是()。
集装箱______装卸机械系统主要对集装箱进行分类堆放,实现集装箱搬运、堆垛作业,所采用的机械设备主要有集装箱跨运车、集装箱牵引车和挂车、叉式装卸车、正面吊运车、轮胎式集装箱龙门起重机等。
-3/4
Duringrecentyearswehaveheardmuchabout"race":howthisracedoescertainthingsandthatracebelievescertainthingsand
某厂拥有三种资源A、B、C,生产甲、乙两种产品。生产每吨产品需要消耗的资源、可以获得的利润见下表。目前,该厂拥有资源A、资源B和资源C分别为12吨、7吨和12吨。根据上述说明,适当安排甲、乙两种产品的生产量,就能获得最大总利润(53)___________
一个栈的初始状态为空。现将元素1、2、3、4、5、A、B、C、D、E依次入栈,然后再依次出栈,则元素出栈的顺序是()。
最新回复
(
0
)