大学英语快速阅读第三版2电子版Word格式.docx

大学英语快速阅读第三版2电子版Word格式.docx

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Biologiststodaydon’texpectthatanyonewillfindamagicalfountainofyouth.Growingolderisanaturalpartofthelifecyclethatcan’tbereversed（倒退）.Ashumanbeingsgrowolder,organssuchastheheartandlungsmaystopfunctioningproperly.Sightandhearingmaybecomeweak.Andthehumanbodybecomesmorelikelytocomedownwithseriousillnessfromwhichitcannotrecover.

Consideredtogether,changesthatbringaboutthedecline（衰退）ofanorganismarecalledaging.Becauseofaging,manybiologistsbelievethattheremaybeamaximum（最大的）agelimittowhicheventhehealthiestorganismscanlive.Forhumanbeings,thismaximumagelimitisabout110years.

Perhapsthemostimportantthingthatyoucanlearnfromyourstudyofhumanbiologyisthatyouhavealotofcontrolovertheagingprocessinyourownlife.Infact;

withinourcontrolaremanyphysicalandmentalfactorsthathavemuchtodowithaging.Forexample,eachofus,asrecentresearchindicates,candomanythingstohelppreventheartandvessel（血管）disease,whichcauseshalfthedeathseachyearintheUnitedStates.Wecanavoideatingalotoffattymeat.Eatingtoomuchofthesetypesofanimalfatscanleadtotheclogging（阻塞）andhardeningofbloodvessels.Wecancutbackonsmokingandhopefullyofsugarweeat.Wecanexerciseregularlyandstrengthentheheartandotherorgans.Andwecanremembertotaketimeouteachdayforourselves,timejusttorelax.Exercise,recreation（娱乐）,andrelaxationallreducestress－innertensionthatishardonallbodyorgans.

Onefinalthingwecandoistotrytokeepawareofadvancesmadeinhealtheducation.Informationisoftenavailablefreeofchargefromhealthclinicsorschools.

（406words）

ComprehensionExercises

Ⅰ.Choosethebestanswerstothefollowingquestions.

1.WhichofthefollowingistheleadingcauseofdeathintheUnitedStates?

A.Heartdisease.

B.Cancer.

C.Alcohol.

D.Smoking.

2.Whathappensaspeoplegrowolder?

A.Theydreamofamagicpilltohelpthemliveahappyandlongtime.

B.Theycomedownwithseriousillnesses.

C.Theirorgansbecomeweakandmaystopworkingproperly.

D.Theirbloodvesselsbecomeclogged.

3.Intheopinionofbiologists,＿＿＿.

A.theagingprocesscanbereversed

B.theagingprocesscanbecontrolledandsloweddown

C.theagingprocesscanbegotridof

D.theagingprocesscangobeyonditslimit

4.Wecanslowdowntheweakeningofallourbodyorgansby＿＿＿.

A.noteatinganimalfat

B.limitingdrinkingandsmoking

C.exercise,recreationandrelaxationtobloodvessels

D.preventingthecloggingandhardeningofbloodvessels

5.Besidesphysicalandmentalfactors,whichofthefollowingalsocontributestolivingalongandhealthylifeaccordingtothepassage?

A.Healtheducation.

B.Traditionalmedicine.

C.Artificialorgans.

D.Theinventionofmagicpills.

Ⅱ.Judgewhetherornotthefollowingstatementsagreewiththeinformationgiveninthepassage,andmarkYforYES,NforNO,orNGifinformationisnotgiveninthepassage.

（）1.Fewpeoplehavethewishoffindingamagicpillthatwouldbeofhelptolivehappilyforever.

（）2.Manybiologistsbelievethateachspecieshasanaturalmaximumagelimit.

（）3.Fromthepassageweknowthatthereismuchwecandotohelppreventmanydiseases.

（）4.Mentalfactorshavelittletodowithgoodhealth.

（）5.Doctorsbelievesthatregularexercisereducesthechancesofgettingheartdisease.

7.TheEarth'

sPast

Ifthehistoryoftheearthcouldbecompressed（压缩）intothespanofoneyear'

stime,thestoryofthehumanracewouldbewrittenasthethelasttwohoursofthefinalday!

ThisfactgivesyouanideaofjusthowoldtheEarthisnowrittenrecordtotellustheEarth'

sgeologicalpast,theEarthhasleftarecordintheformoffossils.

Afossilisthepreservedremainsortracedofanancientlivingthing.Fossilsaremostoftenfoundburiedinrock,buttheymaybones,shells,andwoodyalsobefoundincaves,ancienttar（沥青）beds,andthesolidicethatcoveredtheEarth'

spolarregions.Inalltheseplaces,fossilsareprotectedfromdamagingeffectsofweatheringanderosion（侵蚀）.

Usuallyonlythehardpartsarepreserved.Thehardpartcanincludeones,shells,andwoodytissues.Thesoftparts,likeflesh,eitherdecayorareeatenbyanimalsbeforetheycanbepreserved.Oneexceptioniswhenanorganismissubjecte