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1.可能是：过去铜是人们首选使用的金属，而现在经过若干年仅次于铁成为第二位 3。此为倒装句
wendy_wang
(yoyo)
(#308473@0)
Last Updated: 2001-12-22
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TOEFL：刚刚做了POWERPREP上的模拟题，好受打击啊！因为没有答案，特向大虾们征解。
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