单项选择题
A．double their number every year B．lose a lot of their babies C．move from place to place constantly D．fight and kill a lot of themselves
A．laughs at his own joke B．repeats it several times C．is very serious when he tells it D．is concerned about the reaction of his listeners
A．The humorous story. B．The witty story. C．The comic story. D．All thre