Althoughconsideredanexcellentexercisejumpingropehasneverreceivedwidespreadacceptancebecauseoftworeasons.Firstmostpeoplerecognizejumpingropeasanexcellentformofcardiovascular(心血管的)exercisebuttheyalsobelievethatitissimplytoodifficult.Inotherwordstheydon’tthinkthey’llbeabletocontinuejumpingforthenear20minutesinordertoachieveabeneficialphysicaleffect.Secondmanyregarditassomewhatboringandoverlyrepetitive(重复乏味的)—notassomethingfunorenjoyable.

Asamatteroffactjumpingropecanbegreatfunaslongasyoufindaproperwaytopractiseit.Insteadofdoingtheusualtwo-footbounce(跳)overandoveragainplayersgoodatrope-jumpingoftenchangetheirpatternevery10or20jumps:asinglebounceadouble-bounceaskipaknee-upsideswingsaswellasavarietyofothereasy-to-learnfree-stylerope-jumping.

Nowadaysresearchersarediscoveringthatjumpingropealsopreparesthebrainforlearning.Itisanexerciseallowingbothbrainhemispheres(半球)toperformequallytoeachother.

Inshortjumpingropecanbealife-longactivityrequiringlittleequipmenttimeandspaceyetleadingtoamuchhealthierlife.

1.Onereasonthatcanexplainwhyrope-jumpinghasnotspreadwidelyisthat

　.

A.itbenefitsthecardiovascularsystem

B.itistoodifficultforpeopletolearntojump

C.itisbelievedtobeboringandrepetitive

D.itrequireslittleequipmenttimeandspace

2.ThefirstsentenceinParagraph2meansthat　inrope-jumping.

A.thereisonlyoneproperwaytofollow

B.theusualwayshouldnotbeusedagain

C.theeasiestwayisalwaysthebestone

D.therearedifferentkindsofwaystofollow

3.Accordingtotheresearchersjumpingrope　.

A.onlypreparesthebrainforlearning

B.issuitableforstudentsonly

C.helpsbothbrainhemispheresworktogether

D.canbedangerousforoldpeople

4.Whatdoesthewriterthinkofrope-jumping?

A.Heisstronglyagainstit.

B.Heisforit.

C.Thepassagedoesn’tmentionit.

D.Heknowslittleaboutit.