单项选择题
A．tells it only once B．tells the listener in advance that his story is funny C．doesn't care whether his listeners enjoy it or not D．is very serious when telling it
A．The humorous story. B．The witty story. C．The comic story. D．All three take the same amount of tim
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