unit 4 astronomy the science of the stars 习题

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1、Unit4Astronomythescienceofthestars习题一、单词拼写1．Itcosthimmorethanone________(十亿)dollarstocompletetheproject.2．"Whathappened？"John'smotheraskedhimina________(温和的)voice.3．BeforetheEarth'sprotective________(大气层)wasformed，therewasnolifeexceptinthesea.4．Withthe________(引力)ofthemoonandth

2、esuneachday，tides(潮汐)rollinandrollaway.5．Man-made________(卫星)areusedforsendingandreceivingmessages.6．Smoking________(乘，增加)theriskofheartattacksandotherhealthproblems.7．Eatingtoomanydessertscanbe________(有害的)toone'steeth.8．Globalwarmingand________(气候)changeproblemsareperhapstheg

3、reatestthreatstoourplanet.二、原文填空1．随后它会变成什么没有人知道，直到38～45亿年前，这团尘埃才慢慢地形成一个固体的球状物。________________________________________wasuncertainuntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.2．地球变得如此猛烈，以至于它的形状能否持久还不清楚。Theearthbecame________violent________itwasnotclearw

4、hethertheshapewouldlastornot.3．这就产生了一系列的反应，使得生命就有可能开始发展了。Thisproducedachainreaction，which________________________________________________________.4．而当我试着向前迈步的时候，我发觉我被送出去很远，步子的跨度竟是在地球上的两倍，因而我摔倒了。ButwhenItriedtostepforward，IfoundIwascarried________________________________ontheear

5、thandfellover.5．"天哪，"我大声说。"引力改变了，走路也的确需要练一练了。""Oh，dear，"Icried，"walkingdoesneedabitofpractice________________gravityhaschanged."三、单选1.Thetopleadersofthetwocountriesareholdingtalksinafriendly________.A．atmosphereB．stateC．situationD．Phenomenon2.Doctorsalwaystellusthatdrinkingtoom

6、uch________ourhealth，butsomepeopledon'tcare.A．isharmtoB．doesharmfultoC．isharmfultoD．doharmto3.—I'mthinkingofthetesttomorrow.I'mafraidIcan'tpassthistime.—________！I'msureyou'llmakeit.A．GoaheadB．GoodluckC．NoproblemD．Cheerup4.Accordingtostatistics，amanismorethantwiceaslikelytodieo

7、fskincancer________awoman.A．thanB．suchC．soD．As5.Peter'sjacketlookedjustthesameasJack's，butitcost________his.A．asmuchtwiceasB．twiceasmuchasC．muchastwiceasD．astwicemuchas6.Tenyearsagothepopulationofourvillagewas________thatoftheirs.A．astwicelargeasB．twiceaslargeasC．twiceasmuchasD

8、．astwicemuchas7.SomepartsinSouthChinahaveexperienced__