og 49( 讨论汇总里没有)

49.

A milepost on the towpath read “21” on the side facing the hiker as she approached it and “23” on its back. She reasoned that the next milepost forward on the path would indicate that she was halfway between one end of the path and the other. However, the milepost one mile further on read “20” facing her and “24” behind.Which of the following, if true, would explain the discrepancy described above?

(A) The numbers on the next milepost had been reversed.

(B) The numbers on the mileposts indicate kilometers, not miles.

(C) The facing numbers indicate miles to the end of the path, not miles from the beginning.

(D) A milepost was missing between the two the hiker encountered.

(E) The mileposts had originally been put in place for the use of mountain bikers, not for hikers.

49.

The hiker’s reasoning assumes that the number that faced her indicated distance from the path’s beginning. The numbers on the second milepost show that this assumption was erroneous. They are, however, the numbers that would be expected if the facing number indicated the distance to the path’s end with the number on the back indicating the distance from the beginning. Thus choice C explains the discrepancy and is the best answer.

The next milepost being reversed (Choice A) cannot be in explanation, because if the hiker’s reasoning were accurate both numbers on the milepost would be 22. The units (choice B) would not affect whether the number became smaller or larger. Nor would a missing milepost (choice D) affect the direction of change. The mode of transportation (choice E) is irrelevant to distance

请问“one end of the path and the other”是什么意思呢？

halfway between one end of the path and the other
   也即 halfway between one end of the path （可理解为起点）and the other （end of the path)（可理解为终点）. 即到了整个HIKING 路径的中点。

这个题目的大意就是HIKER见到路标21/23时，以为21是距她HIKING 起点的距离，23是距HIKING 终点的距离，所以她猜测下一个路标应为22/22。而实际上21是距HIKING 终点的距离，23是距她HIKING 起点的距离，所以，她实际上遇到的下一个路标会是20/24。

希望我说清楚了。

多谢楼上们的回复！