2016年12月大学英语四级阅读段落练习题(4)思维导图

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2023-03-16

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思维导图大纲

DefinitionsofObesity

A)Howdoesonedefinewhenapersonisconsideredtobeobeseandnotjustsomewhatoverweight?Height-weighttablesgiveanapproximateguidelineastowhetheroneissimplyoverweightorhaspassedintotheobesestage.

B)TheWorldHealthOrganizationrecommendsusingaformulathattakesintoaccountaperson'sheightandweight.The"BodyMassIndex"(BMI)iscalculatedbydividingtheperson'sweightinkilogramsbythesquareoftheirheightinmeters,andisthusgiveninunitsofkg/m2.ABMIof18.5-24.9isconsideredtobethehealthiest.ABMIofbetween25and29.9isconsideredtobeoverweight,whileaBMIofover30isconsideredtobeobese.

C)However,itisrecognizedthatthisdefinitionislimitedasitdoesnottakeintoaccountsuchvariablesasage,genderandethnicorigin,thelatterbeingimportantasdifferentethnicgroupshaveverydifferentfatdistributions.Anothershortcomingisthatitisnotapplicabletocertainverymuscularpeoplesuchasathletesandbodybuilders,whocanalsohaveartificiallyhighBMIs.AgenciessuchastheNationalCholesterolEducationProgram(NCEP)intheUSAandtheInternationalDiabetesFoundation(IDF)arestartingtodefineobesityinadultssimplyintermsofwaistcircumference.

HealthEffectsofObesity

D)Over2000yearsago,theGreekphysicianHippocrateswrotethat"personswhoarenaturallyveryfatareapttodieearlierthanthosewhoareslender".Thisobservationremainsverytruetoday.Obesityhasamajorimpactonaperson'sphysical,socialandemotionalwell-being.Itincreasestheriskofdevelopingdiabetesmellitustype2("matureonsetdiabetes")andalsomakesType2diabetesmoredifficulttocontrol.Thusweightlossimprovesthelevelsofbloodglucoseandbloodfats,andreducesbloodpressure.Theassociationbetweenobesityandcoronaryheartdiseaseisalsowell-known.

Cancer

E)Furthermore,in2001medicalresearchersestablishedalinkbetweenbeingoverweightandcertainformsofcancer,andestimatedthatnearly10,000Britonsperyeardevelopcancerasaresultofbeingoverweight.Thisfigurewasmadeupof5,893womenand3,220men,withthestrongestassociationsbeingwithbreastandcoloncancers.However,itisthoughtthatbeingoverweightmayalsoincreasetheriskofcancerinthereproductiveorgansforwomenandintheprostateglandformen.

F)Thelinkbetweenbreastcancerandnutritionalstatusisthoughttobeduetothesteroidhormonesoestrogenandprogesterone,whichareproducedbytheovaries,andgovernawoman'smenstrualcycle.Researchershavefoundthatthemoreawomaneats,orthemoresedentaryherlifestyle,thehigheraretheconcentrationsofprogesterone.Thislinkcouldexplainwhywomenfromlessaffluentcountrieshavelowerratesofbreastcancer.Womenfromlessaffluentnationstendtoeatlessfoodandtoleadlifestyleswhichinvolvemoredailymovement.Thislowerstheirprogesteronelevel,resultinginlowerpredispositiontobreastcancer.

G)TheTimesnewspaper,in2002reportedthatobesitywasthemainavoidablecauseofcanceramongnon-smokersintheWesternworld!

Aging

H)ResearchpublishedbyStThomas'Hospital,London,UKin2005showedacorrelationbetweenbodyfatandaging,totheextentthatbeingobeseadded8.8yearstoawoman'sbiologicalage.Theeffectwasexacerbatedbysmoking,andanon-overweightwomanwhosmokes20cigarettesadayfor20yearsadded7.4yearstotheirbiologicalage.Thecombinationofbeingobeseandasmokeraddedatleasttenyearstoawoman’sbiologicalage,andalthoughthestudyonlyinvolvedwomen,theleadresearcherProfessorTimSpectorbelievesthefindingwouldalsoapplytomen.

I)Theagingeffectwasdeterminedbymeasuringthelengthoftelomeres,tiny"caps"ontheendsofchromosomes,whichhelpprotecttheDNAfromtheageingprocess.Indeed,telomereshavebeendubbedthe"chromosomalclock"because,asanorganismages,theybecomeprogressivelyshorter,andcanbeusedtodeterminetheageoftheorganism.Beyondacertainpoint,thetelomerebecomessoshortthatitisnolongerabletopreventtheDNAofthechromosomefromfallingapart.Itisbelievedthatexcessbodyfat,andthechemicalspresentintobaccosmokereleasefreeradicalswhichtriggerinflammation.Inflammationcausestheproductionofwhitebloodcellswhichincreasestherateoferosionoftelomeres.

Dementia

J)Recentresearch(2005)conductedintheUSAshowsthatobesityinmiddleageislinkedtoanincreasedriskofdementia,withobesepeopleintheir40sbeing74%morelikelytodevelopdementiacomparedtothoseofnormalweight.Forthosewhoaremerelyoverweight,thelifetimeriskofdementiariskwas35%higher.

K)ScientistsfromtheAgingResearchCentreattheKarolinskaInstituteinSwedenhavebeenabletotakeinformationsuchasage,numberofyearsineducation,gender,bodymassindex,bloodpressurelevel,physicalactivityandgeneticfactors,assigningeachariskscore.Theythenusedthisinformationtodeviseapredictivetestfordementia.Thistestwillenablepeopleatrisk,forthefirsttime,tobeabletoaffectlifestylechangeswhichwillreducetheirriskofcontractingdementia.

OtherProblems

L)Theworld-wideupsurgeinobesity,particularlyinchildren,isofmajoreconomicconcern,liabletodraineconomies.OffurtherconcernisthatresearchconductedinAustraliaandpublishedin2006,showsthatuptoonethirdofbreechpregnancieswereundetectedbythetraditional"palpation"examination,thedangerbeinggreatestforthosewomenwhoareoverweightorobese—agrowingproportionofmothers.Thismeansthatsuchwomenarenotgettingthetreatmentrequiredtoturnthebabyaroundintimeforthebirth,andinmanycasesrequireanemergencyCaesareansection.

M)Thisisatruehealth-carecrisis,farbiggerthanSevereAcuteRespiratorySyndrome(SARS)andultimately,evenbiggerthanAIDS.

对应题目：

1.Youcanjudgewhetheroneissimplyoverweightorhaspassedintotheobesestageaccordingtotheheight-weighttable.

2.Usingthe"BodyMassIndex"todefineaperson'sweightidealislimited,becauseitdoesnottakesintoaccountmanyvariablessuchasage,genderandethnicorigin.

3.Aperson'semotionalwell-beingwouldbeaffectedbyobesity.

4.Obesityhassomethingtodowithcancerintheprostateglandforman.

5.Womenfromlessaffluentnationstendtohavemuchlessbreastcancer.

6.Anon-overweightwomanwhosmokes20cigarettesadayfor20yearsadded7.4yearstoherbiologicalage.

7.Theexcessbodyfat,likethechemicalspresentintobaccosmoke,canleadtoinflammation.

8.Obesepeopleinmiddleagerunanincreasedriskofdementia.

9.Thepredictivetestfordementiawillhelppeopletoaffectlifestylechangesthatwillreducetheirriskofcontractingdementia.

10.Theworld-wideupsurgeinobesity,particularlyinchildren,willpossiblydraineconomies.

参考答案：

1.A

2.C

3.D

4.E

5.F

6.H

7.I

8.J

9.K

10.L

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