娃娃鱼是世界上最大的 [ ]
A．鱼类
B．爬行动物
C．两栖动物
D．哺乳动物
答案：C
Samuel Clemens, _______ as Mark Twain, was one of the most famous American writer.
A．to know
B．to be known
C．known
D．Knowing
住宅平均层数
