(单选题)12: 请对下面两句话的对错进行判断：
Ⅰ. 在长期内，初级铜的供给比在短期内更有弹性
Ⅱ. 在短期内，再生铜的供给比在长期内更有弹性
A: I和II都是正确的
B: I正确，II错误
C: I错误，II正确
D: I和II都是错误的
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