答案：A

题目分析：考查动词短语辨析。句意：受发生在3月地震的影响，七泉干涸。dry up干涸；dry out dry up 强调completely dry，干透，用在河流的干涸，食物完全烤干，I had my launge dried up 我把衣服烤干了；dry out强调water out，即把水分弄出去，自体发出，用在把衣服晾干等，如：The appple has dried out 苹果脱水干瘦了；dry off（使）弄干， （使）变干，When the bath water started to cool I got out, dried myself off, and dressed.洗澡水开始变凉时我出来了，擦干身子后穿上了衣服；dry away干了 ，如：Store in a cool, dry place away from sunlight. 干燥阴凉避光处保存。 故A正确。

考点:考查动词短语辨析