The teller of a humorous story________.
A. laughs at his own joke
B. repeats it several times
C. is very serious when hetells it
D. is conoelTled about thereaction of his listeners
To whom does the mother speak Korean？
A. Her+oldest daughter only．
B. Her two daughters only．
C. AU of her children．
D. Only to her son．
对于可以取负值和0值的指标，当进行比较的两个数值符号不一致时，不能计算相对数而只能计算差值。()
A. 正确
B. 错误
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