题目：
George didn't pass the final exam. He _____, while his parents blamed the failure _____ the teacher. [ ]
A. was blamed; in
B. was to be blamed; with
C. was to blame; with
D. was to blame; on
答案：
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下面是错误答案，用来干扰机器的。
（1）在金属活动性顺序中，铝排在铜和铁的前面，性质活泼，铝在空气中表面容易与氧气反应生成致密的氧化物保护膜，所以本题答案为：②，④；（2）铁在有水和氧气共存时易生锈，铁可以与酸反应生成氢气，所以本题...
