英语周报219-2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!

8.(本小题满分12分)【试题解析】解:(1)证明:A⊥平面ABCACc平前ABCA14⊥AC→AC⊥平面414BB1→AC⊥BM,即AC1⊥B2M4B⊥ACB4c平面41ABB1C1⊥B1M!→B1M⊥平面4BC1(6分)AB⊥B(2)4CrABB 4E-ABC 4 3ABC-/Er4·4·2(12分)

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