ScientistshavefoundwhatlooklikecavesonMars(火星),andsaytheycouldbeprotectinglifefromtheplanet’sterribleenvironment.ThefirstcavesdiscoveredbeyondtheEarthappearassevenmysteriousblackdotsonthepicturessentba|小学英语问答-字典翻译问答网

问题标题：

ScientistshavefoundwhatlooklikecavesonMars(火星),andsaytheycouldbeprotectinglifefromtheplanet’sterribleenvironment.ThefirstcavesdiscoveredbeyondtheEarthappearassevenmysteriousblackdotsonthepicturessentba

问题描述：

ScientistshavefoundwhatlooklikecavesonMars(火星),andsaytheycouldbeprotectinglifefromtheplanet’sterribleenvironment. ThefirstcavesdiscoveredbeyondtheEarthappearassevenmysteriousblackdotsonthepicturessentbackbyNASA’sMarsOdysseyorbiter.Eachaslargeasafootballfield,theymaybeopeningsintonaturalcavesbelowtheMartiansurface. “IfthereislifeonMars,thereisagoodchanceyou’dfinditincaves,”saidJutWynne,oneoftheresearcherswhonoticedthefeatureswhileworkingonaUSGeologicalSurveyMarsCaveDetectionProgram. JonathanClarke,ageologistwiththeMarsSocietyofAustralia,yesterdaydescribedthediscoveryasexciting. Onephototakenatnightbyaninfraredimager(红外线成像器)showedoneholetobeunusuallywarm,suggestinghotairtrappedduringthedayisflowingout. “Isaid:‘Wow,that’sacave’”Dr.Clarkesaidexcitedly.“Peoplehavebeenlookingfortheseforalongtime;nowwehavefoundthem.” Heagreedsuchcaveswouldbeperfectplacestohuntforlifeescapingfromthebitterlycold,radiation-soaked(充满辐射的),drysurface. “Tinydropsofwatercouldcollectinside,”hesaid.“Iftherearegasescomingout,theycouldprovideenergyforawholerangeofbacteria.Acaveisalsoaprotectionfromradiation;thesurfaceofMarsisexposedtohighlevelsofspaceradiation.” Thecavesprobablyformedwhentube-shapedlaveflows(管状岩浆流)spreadacrosstheplanetlongago.Theoutsideofthetubescooled,formingsolidwalls,whilesomethinghotterinsideallowedtheremaininghavetoflowout,formingcaves. 小题1:Whatdoesthepassagemainlytalkabout?
A．HowthecaveswereformedonMars.	B．HowscientistsfoundthesecavesonMars.
C．CavesonMarsmaybefullofhotairorasignoflife.
D．ScientistshavecompletelyrecognizedthesurfaceofMars.

小题2:Wecanlearnfromthepassagethat .A．waterhasalreadybeenfoundonMarsB．thescientistsfoundallthecavesatnightC．itiscertainthatthereislifeinthesecavesD．thesurfaceofMarsisbitterlycold,radiation-soakedanddry小题3:Accord

刘贤刚回答：

　　小题1:C小题2:D小题3:B小题4:D 　　小题1:这是一道主旨题。本文主要介绍了科学家在火星上发现一些坑洞，这些坑洞可以聚集热空气和水分，使生命出现变得可能。本文也描述了这些坑洞发现的过程和形成原因，但都不是主要描述的内容，所以A项和B项不全面。小题2:这是一道判断题。根据倒数第三段“Heagreedsuchcaveswouldbeperfectplacestohuntforlifeescapingfromthebitterlycold,radiation-soaked,drysurface.”可以判断出火星表面是个极端寒冷、充满辐射、干燥的地方。A、C选项都是文中的推测，并没有得出明确的结论。小题3:这是一道推断题。根据第六段Dr.Clarke的表述“Peoplehavebeenlookingfortheseforalongtime；nowwehavefoundthem.”可知Clarke教授的喜悦是因为人们找这些坑洞很长时间了，现在终于找到了。小题4:这是一道归纳题。根据坑洞中可能出现生命以及倒数第二段“Tinydropsofwatercouldcollectinside,”和“Acaveisalsoaprotectionfromradiation”可以归纳出生命产生需要水和避免辐射。