科普阅读理解.docx

科普阅读理解.docx

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科普阅读理解

Thousandsyearsagomuchofourearthwascoveredwithblocks（块）ofice.Theseiceblockswereastallashighbuildingsinmoderncities.Mostoftheicewasinthenorthern（北方的）partoftheworld.

Thentheiceblocksstartedtomovesouth.Coldandraincamewiththeice.Animalsandpeoplehadtomove.

Atlast,theicebegantomelt（融化）.Afterhalfamillionyears,mostofithadmelted.Morethanhalfoftheearthbecamecoveredwithwater.The climate becamemuchwarmer.Thingsbegantogrow.Theearthbegantolookthewayitlookstoday.

（ ）6.thousandsofyearsagoourearthwasvery____

_____________.

A.warm           B.hot             C.cool            D.cold

（ ）7.Whatdidanimalsandpeopletrytodowhentheiceblocksmovedmouth?

A.theytriedtostopthemmoving.      B.Theytriedtomeltthem.

C.Theytriedtostayaheadofthem.     D.Theytriedtomovebehindthem.

（ ）8.Themeltingicemaybehelpedtoform_____________.

A.mountainsandvalleys             B.thesun,themoonandtheearth

C.citiesandcountries               D.seas,lakesandrivers

（ ）9.Theunderlinedword“climate”means_______________.

A.thefreezingice                  B.theweatheroftheyear

C.themovingoftheiceblocks        D.aplantorananimal

（ ）10.WhichofthesethingsmaybehappenedbecausetheIceAgeended?

a.Forestsgrew                    b.Foodbecamehardertofind

c.Fishingbecameeasier             d.Thetemperaturedropped.

A.a;b           B.b;d          C.c;d            D.a;c

Doyoubelievethattheremightbelifeonotherplanets?

Wouldyouliketobethefirst“Earthling”togetintouchwithanalien?

Well,youcanstartyoursearchfromhome.Allyouneedisa computerandtheInternet,andyoucanjointheprojectoftheUS-based NationalAeronauticsandSpaceAdministration（NASA）.

  NASAstartedtheSearchforExtra-TerrestrialIntelligence（SETI）projecteightyearsago.Itsgoalistoexaminetheradiosignals（信号）fromnearbystars.Researchersbelievethatalargenumberofstarsintheuniversecouldhaveplanetsorbiting（circling）aroundthem.Andtheywanttoknowiftheseplanetshaveconditionssuitableforlifeforms.

  Howdoestheprojectwork?

Thereisahugeradiotelescopewithalargebowl-shapeddishatArecibo,PuertoRico.ItcatchesradiosignalswhicharethenfedintoSETIcomputers.Theresearchershavetostudythousandsofradiosignalsdaily.Theyarelookingforsignalswhosepatterns（模式）wouldshowtheexistence（存在）ofhydrogenorwatermoleculesthatarenecessaryforlifeonEarth.Theycouldbeatitforyearsbeforeshowingasinglepositiveresult!

  Ofcourse,eventheresearchersknowthattheycannotdoafastjobontheirown.Sotheywantasmanyhelpersaspossible.Evenyou!

Tojoinsearch,justdownloadSETI’sfreesoftware（SETI@home）.Whathappensnextisfun.Whileyouareawayfromyourcomputer,theSETIprograminyourcomputerdownloadstheinformationonradiosignalsreceivedbytheradiotelescope.Itstudiestheinformationandsendtheresultbacktotheresearchcenter.

  ThereareotherbenefitstooofhavingtheSETIprojectsoftwareinyourcomputer.Whenyouleaveyourcomputerunattended,insteadofseeingtheusualscreensaver,youcanfeastyoureyesonanamazing3-Dchartonthescreen.ThisshowsthatyourcomputerisbusystudyingSETIdataandsearchingforsignsofalienlife!

  Morethan1824500peoplearoundtheworldarecurrentlyintheprogramandmorearejoiningineveryday.It’sslimchance,butwouldn’titbefantasticifyourcomputerweretobethefirsttodiscoveranaliensignal!

53.Whydoresearchersexaminetheradiosignalsfromnearbystars?

A.Theyplantohelppeoplewholiveonthestars.       

B.Theyneedtomakesurethatthestarshaveplanets.      

C.Theyhavetokeepintouchwiththealiensonthestars.      

D.Theywonderifthestars’planetsaresuitableforlifeforms.

54.Whatdoesahelper’scomputerdointheresearch?

A.Itfindstheradiosignals.       B.Itlooksforotherplanets.      

C.Itshowsapositiveresult.       D.Itstudiestheinformation.

55.What’sthewriter’spurposeinwritingthepassage?

A.Toprovethevalueofaresearch.       B.Toinvitepeopletojoinaproject.      

C.Tosuggesttheexistenceofaliens.      D.Toadvisepeopletostudyplanets.

Whenbusterwasbroughtintotheanimals'home,hewaswetandsmelly.ButJimmywhoworkedthereknowwhatsoapandwaterandagoodbrushingcoulddo.

Afterabath,JimmyputBusterinacageandgavehimsomefoodandfreshwater.

Busterwantedahome.Hewantedafamily.Hewantedayard.Mostofall,hewantedsomeonetolovehim.

Amancameovertothecage.Bustercurleduponhisblanketandclosedeyes.“He’snofun,”saidtheman.“He’stooquiet.”

Afamilycamealong.Busterb