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答案：B
解析：
Line l passes through the points (0,0) and (2,5), so the slope of line l is equal to (5-0)/(2-0) = 5/2. Lines l and m are perpendicular, so the slope of line m is equal to the -reciprocal of the slope of line l. Therefore, the slope of line m is -1/(5/2) = -2/5.
