英语周报2018～2022初二答案

11B【解析】本题考查直线与抛物线的综合应用,考查数形结合和化归与转化的思想由抛物线C1:y2=8x,得焦点为F(2,0).圆的标准方程为(x-12)24y2=4,所以圆心为(2,0),半径r=2.设P(x1,y),Q(x2,y2),设直线l:x=my 2,将直线l代入抛物线方程可得y2-8my-16=0,即yy2=-16,(yy2)2二644,故|PM|·QN|=(|PF|-2)(QF|-2)=x1x2=4.

第四部分写作(共两节,满分35分)第一节短文改错(共10小题;每小题1分,满分10分)Have you ever looked around in a cafe and notice that everyone else has their eyes gluedto their smartphones? You're probable one of them Over 1.8 billion people own smart-phonesbut use their devices on a daily basis. Studies have found that a average person checks his or herphone about 150 time a day. This"addiction"on technology reaches even youngest membersof soDr Jenny Radesky noticed that smartphones took oKparents' attention away from ourchildren. She is worried that this could affect children emotional development. Thereforechildrenswe should pay enough attention to this phenomenon and make some changes

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