中考英语阅读2021(中考英文阅读题)
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Keepyoureyesonthesky―itlookslikewillbeabigyearfortornadoes.AsofthefirstweekinApril,therehavealreadybeen445“twisters”intheUnitedStates.Lastyear,therewereonly96tornadoesbythebeginningofApril.AccordingtotheNationalOceanicandAtmosphericAdministration(NOAA),agovernmentagencythatstudiestheenvironment,thismarksthemostintensetornadoactivityinthefirstthreemonthsofanyyearsince.Previousyearswithabusystarthaveproducedhighnumbersoftornadoesthroughouttheyear.
Forthoselivingin“TornadoAlley”fromwestTexasallthewayuptoNorthDakota,springtimeistornadotime.Whatexactlycausesa“twister”?Tornadoesformwhenmoist,warmairiscaughtunderdry,coolair.Whenthewarmairrises,itupsetsthecoolair,spinning(使快速旋转)theairintoafunnel-likeshape.Thespinningairisofficiallycategorizedasatornadoonceittouchestheground.Thesetwisterscanreachextremelyhighspeeds,sometimesmorethan250milesperhour!
ScientiststrytomeasurethespeedanddamageoftornadoesusingwhatiscalledtheFujitaScale,orF-scale.ThescalerangesfromF0,withwindsunder73mph,toF5,withwindsbetween261and318mph.ViolenttornadoesintheF4andF5categoriessometimeslastmorethananhour,andcauseincredibleamountsofdamage,oftendestroyingeverythingforhundredsofmiles.Fortunately,theseaccountforlessthan1percentofalltornadoes.
Ifthefirstthreemonthsofthisyearareanyindication,therearemoretornadoestocome.Remember,thebestwaytostaysafeduringatornadoistofindshelterinthebasementofastrongbuilding,avoidingwindows.Expertswarnagainsttryingtoescapeatornadoinacar.
Help:tornadon.旋风,龙卷风,大雷雨,具有巨大破坏性的人(或事物)
moistadj.潮湿的
categorize[k?tig[raiz]vt.加以类别,分类
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