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20.解:(1)据题意知,点(2,1)在抛物线C:x2=2py上所以2=2p×1,解得p=2所以抛物线C的标准方程是x2=4y证明:(2)据(1)求解知,抛物线C的方程为y=1x2所以y=5x5分设点D(x),则直线的斜率Ax一6分因为点A与点D关于y轴对称所以有点7分设E(x,x),B(=,),则1x-n+一号m,即x+x=2x因为kA10分所以k+km=2+2=+2二2=0即直线AB的斜率与直线AE的斜率之和为定值12分
第二节书面表达【写作思路】根据试题要求,考生需要写一篇记叙文,记述身边一位值得尊敬和爱戴的人。首先考生需要介绍自己最尊敬和爱戴的人是谁,简单地介绍一下他(她)。然后,陈述为什么他(她)值得尊敬和爱戴。最后,可以对前文进行一个总结,使文章结构严谨。本文的写作重点在""尊敬和爱戴的原因"",考生可围绕这个要点适当拓展,从性格特点、处事风格等方面展开写作。【范文赏读】Themostbelovedandrespectedpersonaroundmeismyteacher,MsLiThoughshehasbeenteachingEnglishfortwentyyears,sheisstillpassionateaboutteaching.SheiskindandconsideratetowardsusjustlikeourdearmotherWeallrespectherbecauseshealwaystriesnewwaystomakeherclasseslivelyandinteresting.Hardworkingandknowledgeable,sheisoneofthebestteachersinourschool.Whenwehaveaproblem,wewillturntoherforhelp.Shealwaystalkstouspatientlyandhelpsustofindasolution.Inoureyes,sheisnotonlyourteacher,butalsoourbestfriend.Thosearewhyshedeservesourrespect【亮点词句】亮点词汇:beloved,respected,bepassionateabout,beconsideratetowards,turntosb.forhelp,inone'seyes亮点句式:Why引导的表语从句(whyshedeservesourrespect)
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