资源描述：
《英语专业四级考试分块练习大汇总-阅读部分》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、阳朔新起点英文书院YangshuoNewStartEnglishCollegeReadingComprehensionDirections:Inthissectiontherearefivepassagesfollowedbyfifteenquestionsorunfinishedstatements,eachwithfoursuggestedanswermarkedA,B,CandD. Choosetheonethatyouthinkisthecorrectanswer.TEXTAPetroleumproducts,such
2、asgasoline,kerosene,homeheatingoil,residualfueloil,andlubricatingoils,comefromonesource--crudeoilfoundbelowtheearth'ssurface,aswellasunderlargebodiesofwater,fromafewhundredfeetbelowthesurfacetoasdeepas25,000feetintotheearth'sinterior. Sometimescrudeoilissecuredbydri
3、llingaholethroughtheearth,butmoredryholesaredrilledthanthoseproducingoil. Pressureatthesourceorpumpingforcescrudeoiltothesurface. Crudeoilwellsflowatvaryingrates,fromtentothousandsofbarrelsperhour. Petroleumproductsarealwaysmeasuredin42-gallonbarrels.Petroleumprod
4、uctsvarygreatlyinphysicalappearance:thin,thick,transparentoropaque,butregardless,theirchemicalcompositionismadeupoftwoelements:carbonandhydrogen,whichformcompoundscalledhydrocarbons. Otherchemicalelementsfoundinunionwiththehydrocarbonsarefewandareclassifiedasimpurit
5、ies. Traceelementsarealsofound,buttheseareofsuchminutequantitiesthattheyaredisregarded. Thecombinationofcarbonandhydrogenformsmanythousandsofcompoundswhicharepossiblebecauseofthecariouspositionsandjoiningsofthesetwoatomsinthehydrocarbonmolecule.Thevariouspetroleump
6、roductsarerefinedfromthecrudeoilbyheatingandcondensingthevapors. Theseproductsaretheso-calledlightoils,suchasgasoline,kerosene,anddistillateoil. Theresidueremainingafterthelightoilsaredistilledisknownasheavyorresidualfueloilandisusedmostlyforburningunderboilers. A
7、dditionalcomplicatedrefiningprocessesrearrangethechemicalstructureofthehydrocarbonstoproduceotherproducts,someofwhichareusedtoupgradeandincreasetheoctaneratingofvarioustypesofgasoline.1.WhichofthefollowingisNOTtrue?A.Crudeoilisfoundbelowlandandwater.B.Crudeoilisalway
8、sfoundafewhundredfeetbelowthesurface.C.Pumpingandpressureforcecrudeoiltothesurface.D.Avarietyofpetroleumproductsisobtainedfromcrude
