2022高三英语周报第42期hz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!

19.证明:(1)连接BG并延长,交AD于M,连接MC在△ABD中,O为BD中点,G在AO上,AG=2G0G为△ABD的重心∴GMBE 2 BG BEEC 1 GM EC∴GE∥MC,GEa平面ACD,ACc平面ACD,∴GE∥平面ACD;(2)在△ABD中,O为BD中点,BD=2,AB=AD=√AO⊥BD∴AO=√AB2-Bo=1,在△BCD中,BC=CD=BD=2,O为BD中点,连接OC,则OC=√3又CA=2,∴OA2+OC2=CA2,∴AO⊥OC由AO⊥OC,AO⊥BD,OC∩BD=O,OC,BDc平面BCD得AO⊥平面BCD,又AOc平面ABD平面ABD⊥平面BCD

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