18.已知二次函数y=x2-2x+c的图象沿x轴平移后经过(-1,y1),(5,y2)两点若y1>y2,则图象可能的平移方式是( )
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| A. | 向左平移5单位 | B. | 向左平移3单位 | C. | 向右平移1单位 | D. | 向右平移2单位 |