Willitmatterifyoudon'ttakeyourbreakfast？RecentlyatestwasgivenintheUnitedStates．Thosetestedincludedpeopleofdifferentages，from12to83．Duringtheexperiment，thesepeopleweregivenallkindsofbreakfasts，andsometime

　　Willitmatterifyoudon'ttakeyourbreakfast？RecentlyatestwasgivenintheUnitedStates．Thosetestedincludedpeopleofdifferentages，from12to83．Duringtheexperiment，thesepeopleweregivenallkindsofbreakfasts，andsometimestheygotnobreakfastatall．Specialtestsweresetuptoseehowwelltheirbodiesworkedwhentheyhadeatenacertainkindofbreakfast．Theresultsshowedthatifapersoneatsaproperbreakfast，heorshewillworkwithbettereffectthanifheorshehasnobreakfast．Thisfactappearstobeespeciallytrueifapersonworkswithhisbrains．Ifastudenteatsfruit，eggs，breadandmilkbeforegoingtoschool，hewilllearnmorequicklyandlistenwithmoreattentioninclass．Contrarytowhatmanypeoplebelieve，ifyoudon'teatbreakfast，youwillnotloseweight．Thisisbecausepeoplebecomesohungryatnoonthattheyeattoomuchforlunch，andendupgainingsomeweightinsteadoflosingsome．Youwillprobablylosemoreweightifyoureduceyourothermeals．

　　21．Duringthetest，thosewhoweretestedweregiven___．

　　A．nobreakfastatall

　　B．averyrichbreakfast

　　C．littlefoodforbreakfast

　　D．differentbreakfastsornone

　　22．Theresultsofthetestshowedthat___．

　　A．breakfasthasagreateffectonworkandstudy

　　B．breakfasthaslittletodowithaperson'swork

　　C．apersonwillworkbetterifhehasasimplebreakfast

　　D．thoseworkingwithbrainsshouldhavealotforbreakfast

　　23．Thepassageinfersthatmanypeoplebelievethatifyoudon'teatbreakfast，youwill___．

　　A．loseweight

　　B．notloseorgainweight

　　C．behealthier

　　D．gainalotofweight

　　24．WhichofthefollowingisNOTtrueaccordingtothepassage？___

　　A．Poorbreakfastsaffectthosewhoworkwiththeirbrains．

　　B．Havingnobreakfastmaycauseonetogetfatter．

　　C．Havingabiglunchandsupperisofgreatvalueinweight-losing．

　　D．Eatinglessforlunchandsuppermayhelptoloseweight．