小说涯

Unit 13（第5页）

Bythetimetheyraduatesfromhighschool，heorsheentroughly11，000hoursinsparedtomorethan22，000hoursinfrontoftelevisiojustwatg’sprograms。Orary，thelargestparttakespla8and11p。m。MhSaturdaya。m。onSunday。

However，60%ofmotherssaidtheyplao“restriouheypermittedtheirtowatchtelevision。Teadparentshavebeeinglyedabouttheeffectsoftelevisiononsaeachershavereportedmoreandmoreiigues，tension，andbadbehaviors。TomiheharmfuleffectsoftelevisioeachersatKimbertonFarmsSPhoenixville，Pennsylvania，havebeenfolluidelinesforfiveyearswhiotelevisionatallfhthefirstgrade。

insedgradethroughhighschoolareeotelevisiononsightsandlimitviewingtoatotalofthreetofourhoursonweekends。Asmasreported，theresultwasobvious。Threedaysaftertheyturhesets，thetratebetter，andweremoreabletofollowdiredgetalongwiththeirneighbors。

&heNatioeacherAssohasbeenwhardinadvigprograms，settiions，andhelpisanddevelopcriticalattitudes。

1。Televisionmightbesideredasamemberofthefamilybecause_____。

A）learnfromit

B）spendsomuittsemphasizeitsimportagitatnightD）doexactlywhattheyaretoldontelevisiopartof’sviewiwatg_____。

&iramsB）prtheeveningC）gameshowsand’sprogramsD）’sprogramsonSaturdaym3。Whichofthestatementsisioion?

A）Itisadvisablethathighschoolstudentsnotwatchtelevisiononsights。

B）igradeischtelevisionatall。

C）Collegestudentsmayspendasmuchtimeastheylikeinwatgtelevision。

D）Preschoolspendmorehoursinfrohanschoolage。

4。Teadparentsbeeinglyedabouttheeffectsoftelevisionbecause_____。

A）televisiohefamilyB）badielevisionhasorongoreTVsetshavebeeiyearsD）morefromtelevisionthasahemainpointofthisseleisthat_____。

A）parentsdon’twatoughtelevisionB）televisionhashelpedimprinationsC）televisiorumeionthanourpublicschoolsD）watchtelevisioeheirviewinghabitsrolledPassage2

AstrohattheexpandiheresultofanenormousandpowerfulexplosioheBigBang。TheBigBangtheorymayexplainhowtheuniverseformed。TheBigBaesthattheuoexpandwiththeexplosioedmatterandenergyandhasbeenexpandingeversince。Agtothetheory，allthematteraheuniversewasoedintoasihisplace，ofcourse，wasextremelyhotaheo20billio，anexplosion—theBigBang—shotthetratedmatterandenergyihefastestmoviraveledfarthestaway。Eoo，beganmovingawayfromtheareaoftheBigBang。

IftheBigBangtheoryiscorreergyleftfromtheBigBangwillbeevehroughouttheuhisenergyisknownasbadradiation。AistshavediscoveredthatthebadradiationisalmostthesamethroughouttheentireuhetbadradiatioionthatsupportstheBigBaertheinitialBigBang，thefahematterragoutwardiion。Gravityisaforceofattrabetwees。Allobjectshaveagravitationalattra。Thisfantopullmatterintoclumps。

Atsometime，theedhugeatter。Theseclumpsbecamethegalaxiesoftheuevenasthegalaxiesweref，thematterihegalaxiesuedtoraceawayfromtheareawheretheBigBanghadocdthisisjustwhatastronomershavediscovered。Allofthegalaxiesarespeedingawayfromtheteroftheuniverse。

1。Whatisthepassagemainlyed?

&heuniverse。B）Openoriverse。

C）TheBigBangtheravitationalattra。

2。Agtothepassage，theBigBangtheoryisimportashedslightonthe_____。

A）formationofthegalaxiesB）formationoftheuniverseatioarsD）futureoftheuowabouttheBigBang，agtothepassage?

A）TheBigBangistheexplosionofbadradiation。

B）Whetheritstheoryiscorreeedstobeproved。

C）TheBigBangisthegeriesy。

D）ThepladtheBigBaanddense。

4。Agtothepassage，galaxieswereformedbecauseof_____。

A）theexpansionoftheuhetraoftheuniverseC）badradiationD）thefravity5。Thegalaxieskeptonmoviheyaremovingihatis_____。

A）towardstheteroftheuniverseB）awayfromtheteroftheuowardsEarthD）awayfromEarth