中考英语阅读2021（中考英文阅读题）

中考是选拔性考试，也是极有竞争性的考试，为了给童靴们复习，巩固各科知识。在中考中取得最好的成果，我们积极帮助各位备战中考，提供大量的考试复习试题资料。祝大家取得大圆满的成功。

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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