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答案：D
解析：
Choice D is correct. Drawing a best fit line on the scatterplot helps to estimate the slope and y-intercept, or in this case, the P-intercept of the line.
According to the line, the P-intercept is about (0,18) and the slope is greater than 4 but less than 6.
Therefore, of the equations given, P=4.3t+18 is the best model of the relationship between t and P.
