阅读理解AFromfaroutinspace,Earthlookslikeablueball.Sincewatercoversthree-fourthsoftheEarth'ssurface,blueisthecolorweseemost.Thecontinentslookbrown,likesmallislandsfloatinginthehuge,bluesea.WhitecloudscoveraroundtheEarthlikealightblanket.TheEarthisshapedlikeasphere,oraball.Itis25,000milesaround!Itwouldtakemorethanayeartowalkaroundthewholeplanet.Aspaceshipcanflyaroundthewidestpartofthesphereinonly90minutes.EventhoughspaceshipshavetraveledtotheMoon,peoplecannotvisittheMoonwithoutspecialsuits.TheMoonhasnoairorwater.Plantsandanimalscan'tlivethereeither.AstronautsfirstlandedontheMoonin1969.Afterthat,thereweresixmoretripstotheMoon.TheybroughtbackMoonrocks,whichscientistsarestillstudying.Thereareholes,orcraters,allovertheMoon'ssurface.Scientistsbelievethatmeteorites(陨石smashedintotheMoonmillionsofyearsagoandformedthecraters.TheSunisthecloseststartoEarth.Astarisahotballofburninggas.TheSunlooksverybigbecauseitissoclose.ButtheSunisjustamedium-sizedstar.Billionsoffar-awaystarsaremuchbiggerthanourSun.TheburninggasesfromtheSunaresohotthattheywarmtheEarthfrom93millionmilesaway!EventhoughtheSunisalwaysshining,thenighthereonEarthisdark.That'sbecausetheEarthrotates,orturnsaround,every24hours.Duringtheday,theEarthfacestheSun.Thenweseelight.Duringthenight,theEarthturnsawayfromtheSun.Thenitfacesthedarknessofspace.EachdaywelearnmoreabouttheEarth,theMoonandtheSun.56.WhenwelookattheEarthfromouterspace,thecolorweseemostisbluebecause.A. mostoftheEarthiscoveredinlandB.theSun'sraysmaketheEarthlookblueC.mostoftheEarthiscoveredinwaterD.cloudswraparoundtheEarth57.What'sthemeaningoftheunderlinedword“smashed”inthesecondparagraph?A. crashedB. madeC. brokeD. got58. WhatcausesdaylightonEarth?A. ThefullMooncausesdaylight.B. DaylightiscausedbytheEarthfacingawayfromtheSun.C.TheheatoftheSun'srayscausesdaylight.D.DaylightiscausedbytheEarthfacingtowardtheSun.59. WhichofthefollowingsentencesBESTdescribestheSun?A. TheSunlookssmallbecauseitissofarfromEarth.B. TheSunisaballofburninggasesthatgiv...
