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．