—Remember this, John. ______ careful you  are,   ______ mistakes you will make.

—Thanks, Miss Rose.     [ ]

A. The more; the less  

B. The more; the fewer

C. The less;  the fewer 

D. The more; the more

下列函数中，对调用它的函数没有起到任何作用的是( )。

A．void f1(double &{--x;}

B．double f2(double {return x-1.5;}

C．void f3(double {--x;}

D．double f4(double *{--*x;return*x;}