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答案：A
解析：
Choice (A) is correct. Given two points on a line, the slope of the line can be found by dividing the change in the y-coordinates between the points by the corresponding change in the x-coordinates. Hence, since line l passes through the points (a,0) and (0,2a), its slope is change in y-coordinates over change in x-coordinates = ((2a)-0)/(0-a) = (2a)/-a = -2.
