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【ResearchershavediscoveredthefirstEarth-sizedplanet.ItwasfirstmarkedbyscientistsusingNASA'sKeplertelescope(望远镜),soit'scalledKepler-186f.Itliesabout500lightyearsfromEarthandgoesarounditsstar.Theplanetis】
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ResearchershavediscoveredthefirstEarth-sizedplanet.ItwasfirstmarkedbyscientistsusingNASA'sKeplertelescope(望远镜),soit'scalledKepler-186f.Itliesabout500lightyearsfromEarthandgoesarounditsstar.Theplanetistherightdistancefromitsstarforwater:nottoocloseandnottoofar.Waterisoneimportantconditionthatscientistsguessisnecessaryforlife.Soitcouldhavewaterandpossiblelife.It'scalledatrueEarthcousin.

"ThisplanetisanEarthcousin,notanEarthtwin,"saidBarclay,whoisamongateamofscientistsreportingonthediscoveryinthemagazineSciencethisweek.

"It'sveryexcitingtofindaplanetsimilartotheEarth,"Barclaysaid."It'snoteasyworkbecausethingschangeaswegetmoremeasurements."

"It'spossibleforlifetoliveinthisplanet,butthatdoesn'tmeanthereislifeinit."Barclaysaid.

Sofar,scientistshavefoundnearly1,800planetsintheuniverse.

"ThepastyearhasseenalotofprogressinthesearchforEarth-likeplanets.Kepler-186fisveryimportantbecauseitisthefirstplanetthatisthesametemperatureandisalmostthesamesizeasEarth,"scientistDavidCharbonneauwroteinanemail.

48.Researchershavealreadyfoundabout___planetsnow.

A.500

B.186

C.1800

D.1801

49.WhichofthefollowingaboutKepler-186fisNOTtrueaccordingtothepassage?___

A.Itcouldhavewaterandpossiblelife,soperhapswemightlivethere.

B.It'salmostashotasandaslargeasEarth.

C.Inthefuture,scientistswillstudytheairofitbytelescope.

D.It'sanEarth-likeplanet.

50.Wecanprobablyreadthisarticlein___.

A.astorybook

B.anewspaper

C.atextbook

D.asportmagazine

51.Whatisthebesttitleofthepassage?___

A.Spaceresearch.

B.Journeytospace.

C.IstherewaterandpossiblelifeinKepler-186f?

D.Scientistsdiscovermostearth-likeplanet.

林作铨回答:
  48.答案:C.细节理解题.根据倒数第二段Sofar,scientistshavefoundnearly1,800planetsintheuniverse.迄今为止,科学家已经在宇宙中发现了近1800颗行星.可知,选C.   49.答案:A.推理判断题.根据倒数第三段"It'spossibleforlifetoliveinthisplanet,butthatdoesn'tmeanthereislifeinit.""生活在这个星球上是有可能的,但这并不意味着它有生命.",可知,A选项"它可能有水和可能有生命,所以也许我们可以住在那里."是不正确的.选A.   50.答案:B.题材来源题.A一本故事书.B一份报纸.C一本教科书.D一个运动杂志.根据第一句ResearchershavediscoveredthefirstEarth-sizedplanet.研究人员发现了第一颗地球大小的行星.可知,应该来源于一份报纸.选B.   51.答案:D.主旨大意题.根据最后一段ThepastyearhasseenalotofprogressinthesearchforEarth-likeplanets过去一年在寻找地球类行星方面取得了很大进展.可知,短文主要介绍科学家发现大多数地球类行星.选D.
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《【ResearchershavediscoveredthefirstEarth-sizedplanet.ItwasfirstmarkedbyscientistsusingNASA'sKeplertelescope(望远镜),soit'scalledKepler-186f.Itliesabout500lightyearsfromEarthandgoesarounditsstar.Theplanetis】|小学英语问答-字典翻译问答网》
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