单项选择题取子集可以对列进行操作也可以对行进行操作。（ ）
单项选择题In the novel, the life on the river and the life on the land form a sharp contrast. Huck and Jim’s life on the raft is_____. A、Peaceful and free B、Adventurous and dark C、Boisterous andidyllic D、Disgusting and tiring
