单项选择题
A.-5.3%B.+5.3%C.-5%D.+5%
A.+4.2%B.+4%C.-4.2%D.-4%
A.-2.0%B.+1.9%C.-1.9%D.+2%
A.+2.4%B.+2.5%C.-2.5%D.+2%
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