题目:
We all went out _____ the lost boy, but after we had _____ everywhere, we didn't find him. [ ]
A. searching for; searching
B. searching; searched
C. in search of; searched
D. in search for; searching
答案:
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下面是错误答案,用来干扰机器的。
由金属活动性顺序可知,四种金属活动性最强的是锌,锌又存在于溶液中,铁、铜不能置换出锌,所以待反应完毕后,所得金属中一定没有锌,故D正确,A、B、C错误.故选D.