2017年12月大学英语四级仔细阅读练习（1）思维导图

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2017年12月大学英语四级仔细阅读练习（1）思维导图

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　　新东方网英语四级频道为大家整理了英语四级仔细阅读练习题库，希望可以为大家带来帮助，预祝大家顺利通过2017年12月大学英语四级考试。

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新东方网英语四级频道为大家整理了英语四级仔细阅读练习题库，希望可以为大家带来帮助，预祝大家顺利通过2017年12月大学英语四级考试。

2017年12月大学英语四级仔细阅读练习题库

Thereisevidencethattheusualvarietyofhighbloodpressureis,inpart,afamilialdisease.Sincefamilieshavesimilargenesaswellassimilarenvironments,familialdiseasescouldbeduetosharedgeneticinfluences,tosharedenvironmentalfactors,ortoboth.Forsomeyears,theroleofone

environmentfactorcommonlysharedbyfamilies,namelydietarysalt(i.e.,sodiumchloride),hasbeenstudiedatBrookhavenNationalLaboratory.Thesestudiessuggestthatlongexcesssaltintakecanleadtohighbloodpressureinmanandanimals.Someindividuals,however,andsomeratsconsumelargeamountsofsaltwithoutdevelopinghighbloodpressure.Nomatterhowstrictlyallenvironmentalfactorswerecontrolledintheseexperiments,somesalt-fedanimalsneverdevelopedhypertensionwhereasafewrapidlydevelopedveryseverehypertensionfollowedbyearlydeath.Thesemarkedvariationswereinterpretedtoresultfromdifferencesingeneticconstitution.

Bymatinglongsuccessivegenerationsofthoseanimalsthatfailedtodevelophypertensionfromsaltintake,aresistantstrain(the"R"strain)hasbeenevolvedinwhichconsumptionoflargequantitiesofsaltfailstoinfluencethebloodpressuresignificantly.Incontrast,bymatingonlyanimalsthatquicklydevelophypertensionfromsalt,sensitivestrain(the"S"strain)hasalsobeendeveloped.

Theavailabilityofthesetwostrainspermitsinvestigationspossible.Theyprovideaplausiblelaboratorymodelonwhichtoinvestigatesomeclinicalaspectsofthehumanhypertension.Moreimportant,theremightbethepossibilityofdevelopingmethodsbywhichgeneticsusceptibility(敏感性)ofhumanbeingstohighbloodpressurecanbedefinedwithoutwaitingforitsappearance.Radioactivesodium22wasanimportant"tool"inworkingoutthecharacteristicsofthesodiumchloridemetabolism.

21.Thestudyoftheeffectsofsaltonhighbloodpressurewascarriedout_______.

A.asmembersofthesamefamilytendtousesimilaramountsofsalt

B.toexplorethelong-termuseofasodiumbasedsubstance

C.becauseitwasproventhatsaltcausedhighbloodpressure

D.becauseoftheavailabilityofchemicallypuresaltanditsderivatives

22.Themaindifferencebetween"S"and"R"ratsistheir_______.

A.needforsodium22B.rateofmating

C.reactiontosaltD.typeofblood

23.Wecaninferfromthearticlethatsodium22canbeusedto_______.

A.controlhighbloodpressure

B.curehighbloodpressurecausedbysalt

C.tellthe"S"ratsfromthe"R"rats

D.determinewhatasodiumchloridemetabolismislike

24.Themostbeneficialresultsoftheresearchmightbe_______.

A.developmentofdietsfreeofsalt

B.anearlycureforhighbloodpressure

C.controlofgeneticagentsthatcausehighbloodpressure

D.theearlyidentificationofpotentialhighbloodpressurevictims

25.Whichofthestatementsbestrelatesthemainideaofthisarticle?

A.Whensaltisaddedratsandhumanbeingsreactsimilarly.

B.Thenearfuturewillseeacureforhighbloodpressure.

C.Themedicalfieldisdesperatelyinneedofresearch.

D.Atendencytowardhighbloodpressuremaybeahereditaryfactor.

参考答案：21.A22.C23.D24.D25.D

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