单选题 The little girl is just learning to walk and she's always ______ over.
A. tumbling B. wagging C. waving D. swaying

【正确答案】 A
【答案解析】tumble摔跤；wag摇摆，摆动；wave挥手致意，波动，摇动；sway摇摆，摇动。小女孩刚学会走路，总是摔跤，所以选A。