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单项选择题

下列函数原型说明中，错误的是________。
A、int f1();
B、int  f2(double=5);
C、 void f3(void); 
D、int  f4(int  a=0,int b);

判断题

One way of being competent in communication is to give to others the identity that they want to hold in a particular interaction—to see them as they wish to be seen and treated.