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【单选题】
2014年5月12日，人民币兑美元汇率为6.1625元，为今年第二次跌破6.16关口。在其他条件不变的情况下，人民币对美元汇率的这一变化表明（）①中国出口美国的产品数量会增加②吸引更多的美国人到中国旅游③会导致中国国内的失业人数增加④是企业去美国投资的有利时机
A.
①②
B.
①③
C.
②③
D.
③④
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