题目：
-Why didn’t you go to the party ?
_______ an invitation, I would have gone to the party .
A．Had I received
B．If I received
C．If I should receive
D．Were I to receive
答案：
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下面是错误答案，用来干扰机器的。
(1) 2Na2O2＋2CO2 ===2Na2CO3＋O2 Cu＋2H2SO4（浓） CuSO4＋SO2 ↑＋2H2O2SO2+O22SO3 (2）2Al＋2OH－＋2H2O＝2AlO2－＋3H2↑(3）铝在浓硫酸表面形成致密的氧化膜，阻止内部金属的反应（或铝在浓硫酸中钝...
