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1、“Theaveragewomantakesinonlytwothirdsoftherecommendeddaily___1___foriron,”notesanotherexpert.“Forawomanwhoalreadyhasapooriron___2___,anyadditionalironlossfromexercisemaybeenoughtotipherovertheedgeintoamoreseriousdeficiency,”notestheexpert.Exercisecan___3___ironlossthrough___4___mechani
2、sms.Someironislostinsweat,and,forunknownreasons,intenseenduranceexerciseissometimes___5___withbleedingofthedigestivesystem.Athletesinhigh-impactsportssuchasrunningmayalsoloseironthroughaphenomenonwheresmallbloodvesselsinthefeetleakblood.Therearethreestagesofirondeficiency.Thefirstandm
3、ostcommonishavinglowiron___6___,aconditionthat___7___hasnosymptoms.Fatigueandpoorperformancemaybegintoappearinthesecondstageofdeficiency,whennotenoughironispresenttoformthemoleculesofbloodproteinthat___8___oxygentotheworkingmuscles.Inthethirdandfinalstage,peopleoftenfeelweak,tired,and
4、___9___----andexerciseperformanceisseverely___10___.1.A)permissionB)marginC)allowanceD)admission2.A)statusB)statueC)studioD)state3.A)resultinB)resultfromC)comeinD)comefrom4.A)alotofB)avarietyofC)plentyofD)aseriesof5.A)connectedB)linkedC)attachedD)associated6.A)storagesB)reservesC)perc
5、entagesD)amounts7.A)onlyB)convenientlyC)conventionallyD)typically8.A)sendB)transportC)deliverD)transmit9.A)shortofbreathB)LackofbreathC)outofbreathD)inonebreath10.A)compromisedB)composedC)compoundD)complicated(3---2A-1)However,mostpeoplewithlowironreservesdon’tknowtheyhavea1,becausetr
6、aditionalmethodsofcalculatingtheamountofironinblood(bycheckinglevelsofthebloodproteinthat2oxygen)arenot3,Beardstates.4,it’simportanttochecklevelsofadifferentcompound,which5theamountofstorageofironintheblood.Whileactive,child-bearingagewomenaremost6tohavelowironstores,henotes,“Menareno
7、tsafe,especiallyiftheydon’teatmeatandhaveahighlevelof7activity.”(An815percentofmalelongdistancerunnershavelowironstores.)Beardandotherexpertssayit’s9forpeopleinthesegroupstohavea10bloodtesttocheckbloodironreserves.1.A).defectB).deficiencyC).defenceD).deficit2.A).translateB).transportC
8、).tra
