2007年12月大学英语四级考试全真预测试卷(一)
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.我的看法。
ShouldSmokingBeCompletelyBanned
PartIIReadingComprehension(SkimmingandScanning) (15minutes)
Directions:Inthispart,youwillhave15minutestogooverthepassagequicklyandanswerthequestiononAnswerSheet1.
Forquestions1-7,mark
Y(forYES)ifthestatementagreeswiththeinformationgiveninthepassage; N(forNO)ifthestatementcontradictstheinformationgiveninthepassage; NG(forNOTGIVEN)iftheinformationisnotgiveninthepassage.
Forquestions8-10,completethesentenceswiththeinformationgiveninthepassage.
Space
OurFutureinSpace:ItHasAlreadyBegun!
Weareallspacetravelers.Butwe’vestayedclosetohomeuntilnow.Oneday,wemayleaveour“mother??ship”Earthtomakeourhomeamongthestars.
Agiant,spherical“spaceship,”about8,000milesindiameter,isspeedingthroughthesolarsystemrightnow.Itiscruisingatanincredible66,600milesperhour.
It’snotagiant,StarWarsmother??ship.It’sspaceshipEarth,thehomeofoverfourbillionpeople.Thiswater??coatedspaceshiphasbeentravelingthroughtheuniverseforaboutfivebillionyears.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.Thisisbeca
usethereisnogravitytopulltheheaviermetalsdown,whilethelighteronesfloatontop.
Fromspace,too,wecanlookdownontheEarthandstudytheatmosphere,itsweather,andtheeffectsofairpollution.
Andbecausethereisnostronggravitytobreakfreefrom,ourfuturehomesawayfromEarthwillbeconvenientstartingpointsfortraveltodistantplanets.
But,whilegoingintospacemightsolvesomeproblems,outerspacecanalsobeadangerousplace.Forexample,inouterspace,wehavetoprotectourselvesfromthedangersofultravioletlightandcosmicrays.UltravioletlightfromthesuncangiveusbadsunburnsrighthereonEarth.Yet,Earth’satmospherescreensoutmostofthatharmfulradiation.Cosmicraysaretinyhigh??energyparticlesfromouterspace.Again,theEarthshieldsusfrommostofthem.
AtHo
12月大学英语四级考试全真预测试卷(一)
