英语周报九年级新目标第4期2018-2023答案

英语周报九年级新目标第4期2018-2023答案已经整理完毕，供同学们学习参考，更多英语周报答案，请关注本网站。

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.(I)证明见解析;(Ⅱ)8(I)取BC的中点为D,连结DF由ABC-EFG是三棱台得,平面ABC∥平面EFG,从而BC/FGCB=2GF,: CD//GF四边形CDFG为平行四边形,∴CG/DFBF=CF,D为BC的中点,∴.DF⊥BC.∴.CG⊥BCDF⊥BC.:.CG⊥BC平面ABC⊥平面BCGF,且交线为BC,CGC平面BCGFCG⊥平面ABC,而ABC平面ABCCG AB(Ⅱ)连结AD由△ABC是正三角形,且D为中点得,;AD由(I)知,AD⊥平面ABC,GF/CDVG-ABC=V4-BCF=3××42×23=8

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