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答案：B
解析：
Choice B is correct.
The s-intercept is the point (d,s)=(0,25). This means that the speed of the roller coaster is 25 meters per second 0 meters from the base of the hill.
The point 0 meters from the base of the hill is at the base of the hill. Therefore, the s-intercept means that the roller coaster has a speed of 25 meters per second at the base of the hill.
