【Ofalltheplanetsnonehascapturedtheworld'simaginationlikeMars.Itsreddishcolorandchangesinbrightnessovertimemaketheplanetanunforgettablesight.活页裁切线】

　　Ofalltheplanetsnonehascapturedtheworld'simaginationlikeMars.Itsreddishcolorandchangesinbrightnessovertimemaketheplanetanunforgettablesight.

　　　活页裁切线

　　InCosmosthetelevisionscienceseriesfromthe1980sscientistCarlSagantalkedaboutsometraditionalideasaboutMars.SomeoftheseideasarefromtheEnglishsciencefictionwriterH.G.Well'sTheWaroftheWorlds.OthersarefromthemistakenscienceofPercivalLowelltheAmericanastronomerwhobelievedintelligentbeingslivedonMars.WellsdescribedMartiansasthreatening.Lowellimaginedthemasthehopefulengineersofgreatworks.CarlSagansaidthatbothideasinfluencedthepublicdeeply.

　　TodayMarscontinuestoexcitehumans—notastheobjectofsciencefictionbutofscientificstudy.SpacescientistshavecollectedawealthofinformationfromspacecraftsthathaveorbitedlandedonanddugintotheMartiansurface.

　　TheSmithsonian'sMarsDayofferedachanceforpeopleofallagestotouchMarsoratleastapieceofit.AllisonandAlyciafromSilverSpringMarylandbroughttheirchildrenGraceSamRyanandEmma.TheyheardaboutMarsanditsgeologyfromexperts.TheycouldseeatestversionoftheVikinglandersthatreachedMarsinJulyof1976.Theyalsosawmeteorites(陨星)knowntohavecomefromtheredorreddishplanet.Eight­year­oldSamlearnedthattheancientdescriptionofMarsasredisnotexactlyright.Hesaid“It'sactuallyorangishmorethanredandit'salsokindofbrown.”Emmaissix.ShelearnedaboutthevolcanicactivitythathasshapedthesurfaceofMars.Shesaid“TheclosestthingtoMars—thestuff—isfromvolcanoesmostly.”

　　MarsDayofferedAllisonandAlycia'schildrenachancetolearnmoreaboutaworldthattheyareverylikelytosetfootonwithintheirlifetimes.

　　31．WhatisParagraph2mainlyabout?

　　A．WhyMartianswereconsideredthreatening.

　　B．WhyMarshascapturedtheworld'simagination.

　　C．WhatpeoplegenerallythoughtofMarsinthepast.

　　D．HowH.G.Wellsgottheideaforhissciencefiction.

　　32．ItisimpliedinParagraph3that________.

　　A．today'sspacescientistsstillknownoth