英语周报答案2022初中答案

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

第15题解析:令x=1得各项系数之和为a,则a=-1,(x2-x-1)(2x-1)5=x2(2x-1)-x(2x-1)3-(2x-1)5,显然这三项展开后,只有后面两项有x,即-x(-1)3-C2x(-1),故系数和为-9

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