2022英语周报 华中高一16期答案

19.(12分)(1)证明:如图,连接PB1交CE于点D,连接DF,EP,CB1,……1分因为E,P分别是B1C1和CC1的中点,故EP∠亏CB1,PD 1DB 22分又BF=2,A1B1=3,故aE=1,故FD∥AP.…3分又FDC平面EFC,所以A1P∥平面EFC.………………………………………………4分(2)解:由AA1⊥底面ABC,AB⊥BC,可得三棱柱ABCA1B1C1的体积V=÷×2×3×3=95分设H为AA1的中点,则CH∥A1P,由(1)可知,CHC平面CEF.…………………………7分如图,延长FH,与BA交于点D,连接CD,故CD∥EF,且AD=A1F=1,…………………分几何体 AHCEFE1B的体积313C棱A-aD一V三棱D=3(S△AD+√S△AB·S△mD+SmD)×310分所以两部分的体积之比为y~。.(或两部分的体积之比为V19-2131313………………………………………………………………12分

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!

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