A:brought u
B:cheered u
C:grew u
D:turned u
Last night somebody Mr. Brown's house and took away many things.
—__________.
一艘轮船从甲港出发,顺水每小时行24千米,3小时到达乙港,返航时逆水航行用5小时回到甲港.这艘轮船往返一次平均每小时行多少千米?