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【单选题】
对于反比例函数 y= k 2 x （k为常数，k≠0），有下列说法：①它的图象分布在第一、三象限；②点（k，k）在它的图象上；③它的图象是中心对称图形；④y随x的增大而增大．正确的说法是（ ）A.
①③④
B.
②③④
C.
①②④
D.
①②③
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