书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

20.答案:A解析:由已知l1垂直于x轴是不符合题意,所以l1的斜率存在设为k1,l2的斜率为k2,由题意有k1·k设A(1),B(xD(x3,y3),E(x4,y4),此时直线l1方程为y=k1(x-1),取方程得k2x2-2k2x-4x+k1=0y=k1(x-1)k2+42k2+4h,同理得x8+x由抛物线定义可知AB|+|DE|=x1+x2+x3+x4+2p+8当且仅当k1=一k2=1(或-1)时,取得等号故选

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