Musiccomesinmanyforms; mostcountrieshaveastyleoftheirown. 1 theturnofthecenturywhenjazzwasborn, Americahadnoprominent 2 ofitsown.Nooneknowsexactlywhenjazzwas 3 ,orbywhom.Butitbegantobe 4 intheearly 1900s.JazzisAmericascontributionto 5 music.Incontrasttoclassicalmusic, which 6 formalEuropeantraditions, jazzisspontaneousandfree?form.Itbubbleswithenergy, 7 themoods, interests, andemotionsofthepeople.Inthe 1920sjazz 8 likeAmerica, and 9 itdoestoday.The 10 ofthismusicareasinterestingasthemusic 11 .AmericanNegroes, orblacks, astheyarecalledtoday, werethejazz 12 .TheywerebroughttoSouthernStates 13 slaves.Theyweresoldtoplantationownersandforcedtoworklong 14 .WhenaNegrodiedhisfriendandrelatives 15 aprocessiontocarrythebodytothecemetery.InNewOrleans, abandoftenaccompaniedthe 16 .Onthewaytothecemeterythebandplayedslow, solemnmusicsuitedtotheoccasion. 17 onthewayhomethemoodchanged.Spiritslifted.Deathhadremovedoneoftheir 18 ,butthelivingweregladtobealive.Thebandplayed 19 music, improvising（即兴表演） onboththeharmonyandthemelodyofthetunes 20 atthefuneral.Thismusicmadeeveryonewanttodance.Itwasanearlyformofjazz.
1.A.ByB.AtC.InD.On
2.A.musicB.songC.melodyD.style
3.A.discoveredB.actedC.inventedD.designed
4.A.noticedB.foundC.listenedD.heard
5.A.classicalB.sacredC.popularD.light
6.A.formsB.followsC.approachesD.introduces
7.A.expressingB.explainingC.exposingD.illustrating
8.A.appearedB.feltC.seemedD.sounded
9.A.asB.soC.eitherD.neither
10.A.originsB.originalsC.discoveriesD.resources
11.A.concernedB.itselfC.availableD.oneself
12.A.playersB.followersC.fansD.pioneers
13.A.forB.asC.withD.by
14.A.monthsB.weeksC.hoursD.times
15.A.demonstratedB.composedC.hostedD.formed
16.A.demonstrationB.processionC.bodyD.march
17.A.EvenB.ThereforeC.FurthermoreD.But
18.A.numberB.membersC.bodyD.relations
19.A.sadB.solemnC.happyD.funeral
20.A.whistledB.sungC.presentedD.showed