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1温馨提示：此套题为Word版，请按住Ctrl,滑动鼠标滚轴，调节合适的观看比例，答案解析附后。关闭Word文档返回原板块。课堂10分钟达标Forcesotherthandamagingwindsarealsoatworkinsidetornadoes.Sometimes,asthewindpassesahouse,thewallsandceilingburstapartasifabombhadgoneoffinside.Thisexplosion(爆炸)iscausedbythelowairpressure(压力)atthecenterofatornado.Thepressureatthecenterofatornadoisusually13poundspersquareinch.However,insidethehousetheairpressureisnormal,about15poundspersquareinch.Thedifferenceof2poundspersquareinchbetweentheinsideandoutsidepressuremaynotseemlikemuch.Butsupposeatornadopassesoverasmallbuildingthatmeasures20by10by10feet.Oneachsquareinchofthebuilding,thereis2poundsofpressurefromtheinsidethatisnotbalancedbyairpressureoutsidethebuilding.Ontheceiling,thataddsuptoanunbalancedpressureof57,600pounds.Thepressureofthefourwallsaddsupto172,800pounds.Ifwindowsareopeninthebuilding,someoftheinsideairwillrushoutthroughthem.Thiswillbalancethepressureinsideandoutsidethebuilding.Butifthewindowsareshuttightly,thehugeinsidepressuremaycausethebuildingtoburst.2Unfortunately,heavyrainoftenoccursinthestormsthatlaterproducetornadoes,sopeopleoftenshuttheirwindows.Thismaycausefarworsedamagelater.【语篇概述】本文主要讲述龙卷风除了具有破坏力极大的风之外,多种力也作用于其内部。Ⅰ.Skimthepassageandtellusthemainidea.Thepassagemainlytellsus_________________________.答案：thedamagewhenatornadooccursⅡ.Readthepassageagainandchoosethebestanswers.1.Whatdidtheparagraphbeforethispassagemostprobablydiscuss?A.Measuringrainfallfromastorm.B.Thepowerfulwindsoftornadoes.C.Thekindsofdamagecausedbyexplosions.D.Repairingthedamagefromtornadoes.【解析】选C。推理判断题。文章一开始就谈到龙卷风发生时,内部的低压引起的“爆炸”会造成墙倒屋塌。在此之前很可能谈论的是“爆炸”所引起的各种破坏程度。2.Whichofthefollowingisthemaintopicofthepassage?A.Howtornadoescanbeprevented.B.Whentornadoesusuallyoccur.C.Wheretornadoesareformed.D.Whytornadoescausesomuchdamage.3【解析】选D。主旨大意题。文章主要是围绕龙卷风造成破坏的原因来展开的。3.Whatisthedifferencepersquareinchbetweentheairpressureinsideabuildingandtheairpressureinsideatornado?A.2pounds. B.10pounds. C.13pounds. D.15pounds.【解析】选A。数字计算题。根据第二段内容及该段第三句“Thedifferenceof2poundspersquareinchbetweentheinsideandoutsidepressuremaynotseemlikemuch.”可知建筑物每平方英寸的气压之差是2磅。4.Whydopeopleshutwindowswhentornadoesoccur?A.Becausethewindisstrong.B.Becausethereisheavyrain.C.Becausetheweatherisfoggy.D.Becausetheweatheriscold.【解析】选B。细节理解题。根据文章最后一段可知答案。关闭Word文档返回原板块