2022英语周报九年级4答案

21.解:(1)∵椭圆的一个顶点恰好在抛物线x2=8y的准线y=-2上,∴一b=-2,即b=2,又∵=y,a2=b2+c2,∴a=4,c=2√3,故椭圆C的方程为g+2=1(4分)(2)易求得P(2,3),∵∠APQ=∠BPQ,则PAPB的斜率互为相反数,可设直线PA的斜率为k,则直线PB的斜率为一k,直线PA的方程为y-√3=k(x-2),设A(x1,y),B(x2,yz),联立」y-3=k(x-2)x2+4y2=16,得(1+4k2)x2+8k(√3-2k)x+4(3-2k)2-16=07分x+2=58(2k-31+4k2同理可得x+2-二86(-2k5)-82+3),分16k16√3kTI 3-1+1+4k2则ky1-3x1+x2)-4kV3∴直线AB的斜率为定值。,(12分)

语篇导读】本文是一篇应用文,介绍了九不剧以及它们的创作者。1A【解析】细节理解题。根据 Australian ComedCosi(5th Round )H Date: April 12-16 7: 30 p. m.:Venue: Beijing Poly Theatre Price: 800-1, 500 yuan可知,答案为A2.C【解析】细节理解题。根据 Twelfth Night By TNTTheatre Britain #f Viola (who pretends to be a boy fallsin love with Orsino. But Orsino in turn is in love withOlivia. When meeting"Viola, Olivia falls in love withher, thinking she is a man.可知,答案为C3.D【解析】细节理解题。根据 Jazz WeekendThomas Enhco Piano Recital #f He is spotted by PeterErskine, who offer to help with Thomas Enhco's firstyCD.In 2004-2005, Thomas creates and records his fiafirst album, esquisse, which is released in200可知是答案为D。

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