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Passage2
Thenextgreatlandareathatmanhopestocolonizeisthemoon.InsizeitisnearlyequaltotheareaofNorthandSouthAmericas.However,itpresentsahostileenvironment.Temperaturesrangefrom+120to-150degreesCentigrade.Thereisnoair,nowater.
Todaythereisconsiderablescientificspeculationaboutlivingonthemoon.Whenmanwillbeginlifeonthelunarsurfaceisstillnotdetermined.Butexpertsbelievethatcolonizationwilltakeplaceinthreesteps.First,therewillbeincreasingperiodsofexplorationwithtemporaryshelters.Theseperiodswillbefollowedbylongerstayswithhousingunderthesurfaceofthemoonanddailynecessitiesbroughtbythecolonizersthemselves.Finally,coloniesthatareself-supportingwillbeestablished.
Theprincipaljoboftheearlysettlerswillbetostayalive.Theywillhavetoplantcropsunderhugedomestoproducefoodandoxygenandfindwatersources.Afterthisisdone,thesettlerswillhavetimetoexplorethepossibilitiesofcommercialdevelopmentandtomakediscoveriesimportanttoscience.
Thecharacteristicsofthemoonthatmakeitbadforhumansurvivalmaymakeitidealforcertainkindsofmanufacturing.Operationsrequiringavacuum,extremecold,orsterilityareexamples.Precisionballbearings,industrialdiamondsorpharmaceuticalsmightbeproducedonthemoon.
6.Theareaofthemoonis_________.
A.aboutthesameasthatofNorthandSouthAmericas
B.largerthanthatofNorthandSouthAmericas
C.equaltothatofNorthandSouthAmericas
D.farsmallerthanthatofNorthandSouthAmericas
7.Thetemperatureonthemooncanbeashighas________.
A.-150℃
B.+270℃
C.+120℃
D.-30℃
8.Accordingtothispassage,thecolonizationofthemoon__________.
A.willsoonberealized
B.canbedoneunderthelunarsurface
C.isbeingspeculatedbymanyscientists
D.soundsentirelyimpossible
9.Tostayaliveonthemoon,theearlysettlersmustfirstofallbeableto_________.
A.developcommerce
B.getenoughfood,oxygenandwater
C.makediscoveriesimportanttoscie