首页
登录
职称英语
[originaltext]The winds of a tornado are the most violent and destructive ones
[originaltext]The winds of a tornado are the most violent and destructive ones
游客
2024-03-09
6
管理
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://tihaiku.com/zcyy/3517662.html
相关试题推荐
[originaltext]Goodmorning,IamTedHunter.TodayIamgoingtotalktoyo
[originaltext]InBritaintheweatherisnews.Atelevisionweatherforecast
[originaltext]W:WelcometoBackpackTravel!I’myourhost,StacyGoodwin.Tod
[originaltext]Yourchoiceofrunningshoeisaverypersonaldecision.f201
[originaltext]Iamahealthpsychologist,andmyworkistohelppeoplebe
[originaltext]W:AndnowhereisourguestHarrisonBlacktotellusaboutLond
[originaltext]W:Goodafternoon.ThisisJanespeaking.HowcanIhelpyou?M:
[originaltext]Well,mytopictodayisthedoctor-patientrelationship.All
[originaltext]Inarecentstudyofsix-andseven-year-oldsinthePhiladelp
[originaltext]W:Excuseme.I’mlookingforsomeonewhocanhelpmewiththete
随机试题
[originaltext]W:Hi,Michael.Icanhardlyrecognizeyou.Whyareyoudressedu
【S1】[br]【S5】J此空考查固定短语搭配,能与to搭配且意思也恰当的是动词relate,relateto意为“有关、涉及”。
Completethenotesbelow.WriteNOMORETHANTHREEWORDSforeachanswer
基本要求: (1)有合适的板书; (2)引导学生猜想、证明勾股定理的
滑稽戏源于( )。A.优 B.笑 C.乐 D.曲
物联网的定义和范围只是指基于RFID技术的物联网。()
血清钾升高,可见于A.挤压综合症 B.原发性醛固酮增多症 C.代谢性酸中毒
在混凝土基准配合比设计阶段,通过具体的坍落度试验,下列调整初步配合比设计方法正确
脑干损伤瞳孔变化的特征为()。A.双侧瞳孔散大、固定 B.伤后双侧瞳孔立即缩
签订、履行合同失职被骗罪主观方面是故意。
最新回复
(
0
)