Our school had a school choir competition June 20. As Panning, the competition tookonplannedplace in the main hall. I was very nervousafter we began to perform. Hid!"IStartto have thebeforestartedhiccups(t] WM). Lisa advised me to hold my breath and countedto ten, while Amy brought somecountwarm water and asked me to drinkthemwaItMy friends tried to help me in manybut nothingwaysworked."BOO! " Tony frightened me from behind my back. I was Suchsurprised that my hiccupsstopped, At last, we sang inbeautifully harmony on the stage.beautiful

15.(1)(2)【解析】(1)施加压力前,设大气压强为2,对小瓶山平衡条件得mogtpoS=PIS(1分)又p1=p0+pgh(1分)解得h=(2)设施加压力前瓶内空气柱的长度为L,施加压力后瓶内空气柱的长度为H,由平衡条件得mog+ Po S=p2S(1分)由玻意耳定律得户1SL=p2SH(1分)瓶内空气柱长度的变化量△L=L-H(1分)L解得△L=k+2(1分)则(1分)L k+2

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