参考答案

正确答案：A
解析：生词猜测题。参见最后一段：Before this water evaporates it is lifted an average of 80 feet through trunks and branches．Anyone thinks this a trifle would do well to work out how many bucks it would mean，to which floor．Quite achievement.(这20吨水在蒸发之前平均每日先要沿树干与树枝上升80英尺。如果有人认为这只是小事一桩，试想一下20吨的水上升80英尺意味着要提多少桶水爬多少层楼。)