2022山西省英语周报李思答案

第二节【参考范文】Immediately, the class became excited. The class were all talking about their holiday stories incheerful spirits. While Rafael, who looked at the cheerful faces with total dtmfusion, soon handedme a note, which said,"What happened? "Unwillingly, I wrote back "Sharing holiday stories.and couldn't help complaining in my mind, "Nothing to do with you. "Then, Ms. Sullivan askedAnyone wants to share the stories on the stage? Silence fell in the classroom. Seconds later, alittle hand beside me shot up. It was RafaelThen Rafael rose and walked onto the platform. Undcr our astonished starcs, Rafael started hisstory. So fluently and vividly did he speak that we could hardly believe our ears. When the storywas finished, claps burst out in the classroom. And our teacher also nodded, thumbing up at himAmazed at his gorgeous performancc. I was ashamed at my previous rude behavior. When Rafaelreturned, I wrote to him on a picc of papcr, Can we bc fricnds? "and I was also worried toreceive his refusal. To my surprise. after reading it, he nodded at me with a sincere smile

14.-12【解析】对(x-y)°,它的二项展开式的通项为T+1=Cx-(-y)=C(-1)yx“-y,所以(2x-1)(x-y)°的展开式中x2y5的系数为2C(-1)5=-12

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