参考答案：A

解析：动词辨析。a weakness in one leg一条腿虚弱；limp跛行：He limped off the football field．他一瘸一拐地走出足球场。fall倒下，落下：The book fell off the shelf．这本书从架子上掉了下来。rest休息：I rested for an hour before I went out．我在出去前休息了一个小时。suffer遭受，忍受：suffer pain受痛苦。