2022英语周报高二第二十期答案

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!

17.解:(1)∵△ABC为正三角形,D为AC中点,∴BD⊥AC,由AB=6可知,CD=3,得BD=3√3,S△BD=方·CD)·BD=又∵A1A⊥底面ABC,且A1A=AB=6,∴C1C⊥底而ABC,且C1C=6,S△n·CC1=93(3分)2)∵AA⊥底面AB∴A1A⊥BD.又BD⊥AC,∴BD⊥平面ACC1A1又BD平面BC1D∴平面BC1D⊥平面ACC1A1(6分)(3)连接B1C交BC1于O,连接OD,BI在△B1AC中,D为AC中点,O为B1C中点,所以OD∥AB1又ODc平面BC1D,AB1￠平面BCD,∴直线AB1∥平面BCD(10分)

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