大学英语四级试题.docx
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大学英语四级试题.docx
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大学英语四级试题
英语四级试题下载
PartIWriting(30minutes)
Directions:
Forthispart,youareallowed30minutestowriteacompositiononthetopicShouldSmokingBeCompletelyBanned.Youshouldwriteatleast120wordsfollowingtheoutlinegivenbelowinChinese:
1.有人赞同完全禁止吸烟,理由是……
2.有人不赞同完全禁止吸烟,理由是……
3.我看法。
ShouldSmokingBeCompletelyBanned
PartIIReadingComprehension(SkimmingandScanning)
(15minutes)
Directions:
Inthispart,youwillhave15minutestogooverthepassagequicklyandanswerthequestionsonAnswerSheet1.
Forquestions1-7,mark
Y(forYES)ifthestatementagreeswiththeinformationgiveninthepassage;
N(forNO)ifthestatementcontradictstheinformationgiveninthepassage;
NG(forNOTGIVEN)iftheinformationisnotgiveninthepassage.
Forquestions8-10,completethesentenceswiththeinformationgiveninthepassage.
Space
OurFutureinSpace:
ItHasAlreadyBegun!
Weareallspacetravelers.Butwe’vestayedclosetohomeuntilnow.Oneday,wemayleaveour“mothership”Earthtomakeourhomeamongthestars.
Agiant,spherical“spaceship”,about8,000milesindiameter,isspeedingthroughthesolarsystemrightnow.Itiscruisingatanincredible66,600milesperhour.
It’snotagiant,StarWarsmother-ship.It’sspaceshipEarth,thehomeofoverfourbillionpeople.Thiswatercoatedspaceshiphasbeentravelingthroughtheuniverseforaboutfivebillionyears.Onlywithinthepast25years,however,havesomeofitspassengersbrokenfreeofEarth’sgravity.
But25yearsfromnow,manypeople,includingyou,mightliveinanorbitingspacestation200milesabovetheEarth.
SpaceCities
Scientistshavealreadydesignedspecialspacefactories.Thesefactorieswilltakeadvantageoftheabsenceofgravity(zerogravity)toproduceeverythingfromlife-savingdrugstoperfectballbearings.
Otherscientistshavedesignedspacecolonies,completewithfarms,schools,andartificialdayandnight.Hundreds,oreventhousands,ofpeoplewilllive,work,play—evengotoschool,farabovetheEarth.
Ourconquestofspace,ofcourse,hasalreadybegun.WehaveexploredpartoftheMoon,sentrobotspaceshipsontothesurfaceofVenusandMars,andaimedspaceprobespasttheplanetsofJupiterandSaturn.
LastJune,onerobotship,Pioneer10,leftoursolarsystemforever.AndastronautsfromboththeSovietUnionandtheUnitedStateshavelivedinspacestations.
Theconquestofspace,withoutquestion,isoneofthegreatestadventureshumanbeingshaveeversetouton.Butitmaybemorethanagreatadventure.Somescientiststhinktheconquestofspacemaybeanecessityforsurvivalofthehumanspecies.
WearetearingupmoreandmoreoftheEarthtogetrawmaterialsforindustry.Andwearepollutingtheairandwateraswemanufactureproductsthatweneedorwant.Almosteverythingthatseemstomakeourlivesmorecomfortable,andfromelectricitytopesticides,usesuporaltersapieceofourplanet’snaturalenvironment.
WhyGointoSpace?
Yetoursolarsystemisfullofresources.Themoonischockfullofvaluablemetals.Soaretheasteroids,thesmall,rocky,planet-likebodiesorbitingthesunmostofthembetweenMarsandJupiter.Thesemetals,ifwecangetthem,couldbeusedtobuildfactoriesandspacestations.
Also,inspace,thereisnoatmospheretofilteroutthesun’senergy.Thereisplentyofsolarenergytobeturnedintoelectricityformanufacturing,forcreatingcomfortablelivingconditions.
GettingawayfromEarthhasotheradvantages,too.Modernindustryusesmanykindsofmetalalloys(mixturesofmetalthatarebetterforcertainpurposesthanpuremetals).Yetsomemetalalloyseithercan’tbemadeorareveryexpensivetomakeonEarthbecauseofgravity.Forinstance,certainmetalsdon’tmixwellonEarth.Butinzerogravity,molten(hot,liquid)metalsmixmoreevenly.Thisisbecausethereisnogravitytopulltheheaviermetalsdown,whilethelighteronesfloatontop.
Fromspace,too,wecanlookdownontheEarthandstudytheatmosphere,itsweather,andtheeffectsofairpollution.
Andbecausethereisnostronggravitytobreakfreefrom,ourfuturehomesawayfromEarthwillbeconvenientstartingpointsfortraveltodistantplanets.
But,whilegoingintospacemightsolvesomeproblems,outerspacecanalsobeadangerousplace.Forexample,inouterspace,wehavetoprotectourselvesfromthedangersofultravioletlightandcosmicrays.UltravioletlightfromthesuncangiveusbadsunburnsrighthereonEarth.Yet,Earth’satmospherescreensoutmostofthatharmfulradiation.Cosmicraysaretinyhighenergyparticlesfromouterspace.Again,theEarthshieldsusfrommostofthem.
AtHomeinSpace?
Butinspace,withoutspecialprotection,wewouldbeexposedtomuchstrongerradiationfromultravioletlightandcosmicrays.Also,inthezerogravityofouters
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