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oldsuggestionthatcountingsheepwillputyoutosleep！

Agoodtitleforthispassageis________.

a.Sleepb.GoodHealthc.Dreamsd.WorkandRest

Theword"drowsy"inthelastparagraphmeans________.

a.sickb.standupc.asleepd.alittlesleepy

Thispassagesuggeststhatnotgettingenoughsleepmigakeyou________.

a.dreammoreoftenb.havepoorhealth

c.nervousd.breathequickly

DuringREM,________.

a.youreyesmovequicklyb.youdream

c.youarerestlessd.bothAandB

Theaveragenumberofhoursofsleepthatanadultneedsis________.

a.approximatelysixhoursb.aroundtenhours

c.abouteighthoursd.notstatedhere

Questions41to45arebasedonthefollowingpassage:

Themakingofglassisaveryoldindustry—atleast4,500yearsold.Glasshasmanyextraordinaryqualitiesanditisfrequentlybeingusedinnewways.

Oneofthemostinterestingnewusesforglassisintelephonemunication.Scientistshavedevelopedglassfibersasthinashumanhairwhicharedesignedtocarrylightsignals.Whenthelightreachestheotherend,itisfirstchangedintoelectricalsignals,whichareinturnconvertedintosoundmessages.

Calledlightwavemunication,thenewsystemwasusedsuccessfullyinanexperimentinChicagoin1977.Duringtheexperiment,twoglassfiberswereabletocarry672conversationsatthesametime.Thelightwavecable,containing144glassfibers,hasthecapacitytocarry50,000conversationsatthesametime.

Thelightwavemunicationsystemhastwoimportantadvantages.First,theglassfibercablesaresmallerandweighlessthancoppercables.Second,theycostless.

Perhapsitcanbesaidthattelephonemunicationhasenteredtheageoflight！

Oneoftheextraordinaryqualitiesofglassisthatiscancarry________.

a.soundsignalsb.lightsignalsc.electricalsignalsd.anysignal

Beforeyoucanhearamessageonthetelephoneusingthenewsystem,________.

electricalsignalsmustfirstbechangedintolightsignalsandthenintosound

thelightsignalshavetobechangeddirectlyintosoundmessages

ligustfirstbechangedintoelectricalsignalsandthenintosound

eitherthelightortheelectricalsignalshavetobechangedintosoundmessage

Accordingtothepassagethenewtelephonemunicationsystem________.

hadbeenusedwithinlimitedscopebefore1977

wasfirstputintoactualusein1977

hadbeenrepeatedlyexperimentedonbefore1977

wasputonexperimentin1977

Fromthepassage,youcantellthatpeoplepreferglassfibercablestocoppercablesbecause________.

glassfibersarelessexpensive

glassfibersdelivermessagesdirectly

glassfibersaremoreuptodate

glassfibersareeasiertomake

Whichofthefollowingstatementsbestexpressesthemainideaofthepassage

Glassisveryusefulbecauseithasmanyunusualqualities.

Lightsignalshavechangedtheuseofglassinindustry.

Glassfibershavereducedthecostoftelephonemunication.

Theuseofglassfiberstocarrytelephonemessagesisaninterestingnewdevelopment.

PartIIICloze(15%)

Carsareanimportant(46)________oflifeintheUnitedStates.Withoutacarmostpeoplefeelthattheyarepoor.And(47)________ifapersonispoorhedoesn'tfeelreallypoorwhenhehasacar.

Therearethreemainreasonsthecarbecameso(48)________intheUnitedStates.(49)________ofallthecountryisahugeoneandAmericansliketomovearoundinit.Thecarprovidesthemostfortableand(50)________formoftransportation.(51)________acarpeoplecangoanyplacewithoutspendingalotofmoney.

Thesecondreasoncarsarepopularisthefact(52)________theUnitedStatesneverdeveloped(53)________andinexpensiveformofpublic(54)________.Long-distancetrainshaveneverbeenasmonintheUnitedStatesastheyareinotherpartsoftheworld.Nowadaysthereisagoodsystemofair-serviceprovidingplanes.Butitis(55)________expensivetobeusedfrequently.

Thethirdreasonisthemostimportantone,though.TheAmericanspiritofindependenceis(56)________reallymadecarspopular.Americansdon'tliketowait(57)________abus,oratrainorevenaplane.Theydon'tliketohaveto(58)________anexactschedule.Acargivesthemthefreedomtoschedule(59)________time.AndthisisthefreedomthatAmericanswant(60)________tohave.

a.roleb.partc.effectd.basis

a.everb.stillc.evend.quite

a.qualifiedb.increasingc.developingd.popular

a.Firstb.Firstlyc.Atfirstd.Thefirst

a.cheapb.mostcheapc.cheapestd.cheaper

a.Throughb.Sincec.Withd.As

a.whichb.thatc.whered.what

a.aninterestedb.anaffectedc.anefficientd.asatisfied

a.movementb.carriagec.shippingd.transportation

a.veryb.soc.tood.as

a.thatb.whatc.howd.which

a.forb.onc.besided.