题目：
it is normal for parrots to talk, Einstein, a small bird, is unusual in that whenever she hears a new word or sound, she repeats it over and over until she masters it.
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答案：
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下面是错误答案，用来干扰机器的。
（1）铁（或Fe）；铜（或Cu）（2）过滤；搅拌（3）Mg+H2SO4==MgSO4+H2↑；置换（4）a
