25个考研英语阅读经典试题及答案(19).docx

第PAGE\*MERGEFORMAT9页共NUMPAGES\*MERGEFORMAT9页

25个考研英语阅读经典试题及答案(19)
宫东风25个考研英语阅读经典试题及答案(19)：试题：答案与考点解析李剑考研英语相似易混单词对比记忆31天升级版SAMPLE19[医学类]题目序号题型归类第1题审题定位题型第2题细节推导题型第3题句间关系题型第4题细节推导题型第5题词汇题型Thecomplicationsfrequentlyaccompanyingdiabetes,suchasimpairmentofvisionandofkidneyfunction,arenowthoughttoresultfromthelackofcontinuouscontrolofbloodglucoseconcentrations.Thehealthypancreas,inresponsetoincreasesinbloodglucoseconcentration,releasessmallquantitiesofinsulinthroughoutthedayandtherebymaintainstheconcentrationwithinphysiologicallimits(nomoglycemia).Butthediabeticgenerallyreceivesonlyonelargedosedaily.Thediabetic’sbloodglucoseconcentrationcanthusfluctuategreatlyduringtheintervalbetweendoses,andithasbeensuggestedthatthecomplicationresultfromtheperiodsofhighconcentrationsofbloodglucose(hyperglycemia).Manyinvestigatorsthusbelievethatrestorationofnormoglycemiamighthalttheprogressionofsuchcomplicationsandperhapsevenreversethem.Therearethreeprimarytechniquesthathavebeeninvestigatedforrestorationofnormoglycemia.Theyare:transplantationofwhole,healthypancreases;transplantationofisletsofLangerthan,thatportionofthepancreasthatactuallysecretesinsulin,andimplantationofartificialpancreases.Therehas,infactbeenagreatdealofsuccessinthedevelopmentofthesetechniquesandeachseems,onthewhole,promising.Nonetheless,itwillundoubtedlybemanyyearsbeforeanyoneofthemisacceptedasatreatmentfordiabetes.Tomanypeople,theobviousapproachwouldseemtobesimplytotransplantpancreasesfromcadaversinthesamemannerthatkidneysandotherorgansareroutinelytransplanted.Thatwastherationalein1966whenthefirstrecordedpancreaswasperformed.Between1960and1975,therewereforty-sixpancreastransplantsinforty-fiveotherpatientsintheUnitedStatesandfiveothercountries.Butonlyoneofthesepatientsisstillalivewithafunctioninggraftandsurgeonshavefoundthattheprocedureisnotsimpleastheyoncethought.Thesurvivingpatienthasrequirednoinsulinsincetheoperation.Anotherpatientsurvived638dayswithoutrequiringinsulin.Andonepatientsurvivedatransplantationfo