2021-2022 英语周报 九年级 牛津 1答案

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)

第三节One possible version:Work plays an extremely important role in Americanculture. sope ople find retirement difficultas they may feeluseless without jobs. Retirement can also bring financialproblems as Social Security cheeks dont provide enoughmoney. However, some senior citizens feel happy aboutretirement as they finally get time to do what they reallywant. American government is solving retired citizensproblems and considering their special needs, which is wiseand necessary, because everyone will get oid.

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