初三阅读理解专项训练

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1、初三阅读理解专项训练   　　Passage1　　Ifyoulookattheskyonenightandseesomethingmovingandshiningthatyouhaveneverseenbefore,itmightbeacomet(彗星).　　Acometsometimeslookslikeastar.Likeaplanet,acomethasnolightofitsown.Itshinesfromthesunlightitreflects(反射).Liketheearth,acometgoesroundthesun,butonamuchlongerpath(轨

2、道)thantheearthtravels.　　Ifacometisn’tastar,whatisitthen?　　Somescientiststhinkthatalargepartofacometiswaterfrozenintopiecesoficeandmixedwithironandrockdustandperhapsafewbigpiecesofrock.Whensunshinemelts(融化)theiceinthecomet,greatcloudsofgasgotrailingafterit.Theseclouds,togetherwiththedust,form

3、alongtail.　　Manypeopleperhapshaveseenacomet.Howevernooneknowshowmanycometsthereare.Theremaybemillionsofcomets,butonlyafewcomecloseenoughforustosee.　　AnEnglishmannamedEdmundHalley,wholivedfrom1656to1742,foundoutalotaboutthepathsthatcometstakethroughthesky.Somecometsmoveoutofoursightandneverco

4、meback.Otherskeep..comingbackatregulartimes.AbigcometthatkeepscomingbackwasnamedafterHalleybecausehewastheonewhoworkedoutwhenitwouldcomebackagain.MaybeyouhaveeverseenHalley’sCometsbecausethelasttimeitcameclosetothesunandtheearthwasintheyear1986.Thenpeopleallovertheworldwereoutsideatnighttolo

5、okatit.YouwillprobablybeabletoseeHalley’sCometswhenitcomesneartheearthagain.　　1.Acometislike________.　　A.sunB.moonC.sunlightD.theearth　　2.Alargepartofacometis______.　　A.waterandrock　　B.waterfrozenintopiecesoficeandmixedwithiron　　C.ice,ironandrockdust　　D.onlyafewbigpiecesofrock　　3.Maybemanype

6、ople_______.　　A.haven’tseenanycometsB.haveseenallcomets　　C.haveseenacometatdaytimeD.haveseenacomet　　4.Somecometskeepcomingback________.　　A.atanytimeB.atnoonC.atregulartimesD.atdaytime　　5.Halley’sCometscameback_____.　　A.in1990B.in1980C.in1986D.in1989　　Passage2..　　【答案与解析】本文向我们介绍了有关彗星方面的知识。与地球一

7、样，彗星也是绕太阳旋转的，它本身不发光，靠反射太阳的光而发亮。短文中还介绍了彗星的成因，它拖着的长尾巴是如何形成的以及著名的哈雷彗星名字的由来。　　1.D。“Liketheearth,acometgoesroundthesun,but…”是判断本题的根据。　　2.C。根据“…iswaterfrozenintopiecesoficeandmixedwithironandrockdustandperhapsafewbigpiecesofrock.”这句话即能得出答案。　　3.D。由第五段的首句“