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1、英语专业四级模拟试题五TEM-4Exercise05ReadingComprehensionDirections:Inthissectiontherearefivepassagesfollowedbyfifteenquestionsorunfinishedstatements,eachwithfoursuggestedanswermarkedA,B,CandD.Choosetheonethatyouthinkisthecorrectanswer.TEXTAPetroleumproducts,suchasgasoline,kerosene,ho
2、meheatingoil,residualfueloi1,and1ubrieatingoils,comefromonesource—crudeoi1foundbelowtheearth'ssurface,aswel1asunderlargebodiesofwater,fromafewhundredfeetbelowthesurfacetoasdeepas25,000feetintotheearth'sinterior・Sometimescrudeoilissecuredbydrillingaholethroughtheearth,butmor
3、edryholesaredrilledthanthoseproducingoil.PressureatthesourceorpumpingforcescrudeoiItothesurface・Crudeoi1wellsflowatvaryingrates,fromtentothousandsofbarrelsperhour・Petroleumproductsarealwaysmeasuredin42-gallonbarrels・Petroleumproductsvarygreatlyinphysicalappearance:thin,thic
4、k,transparentoropaque,butregardless,theirchemicalcompositionismadeupoftwoelements:carbonandhydrogen,whichformcompoundscalledhydrocarbons・Otherchemicalelementsfoundinunionwiththehydrocarbonsarcfewandarcclassifiedasimpurities.Traceelementsarcalsofound,butthesetireofsuchminute
5、quantitiesthattheyciredisregarded・Thecombinationofcarbonandhydrogenformsmanythousandsofcompoundswhicharepossiblebecauseofthecariouspositionsandjoiningsofthesetwoatomsinthehydrocarbonmolecule・Thevariouspetroleumproductsarerefinedfromthecrudeoi1byheatingandcondensingthevapors
6、・Theseproductsaretheso-calledlightoiIs,suchasgasoline,kerosene,anddisti1lateoil.Theresidueremainingafterthelightoilsaredistilledisknownasheavyorresidualfueloi1andisusedmostlyforburningunderboilers・Additiona/1complicatedrefiningprocessesrearrangethechemicalstructureofthehydr
7、ocarbonstoproduceotherproducts,someofwhichareusedtoupgradeandincreasetheoctaneratingofvarioustypesofgasoline・1.WhichofthefollowingisNOTtrue?A.Crudeoi1isfoundbelowlandandwater・B.Crudeoilisalwaysfoundafewhundredfeetbelowthesurface・C.Pumpingandpressureforcecrudeoiltothesurface
8、・D.Avarietyofpetroleumproductsisobtainedfromcrudeoil.Manythousandsofhydrocarboncom
