The new stadium being built for the next Asian Games will be _____ the present one.[ ]

A. as three times big as      

B. three times as big as

C. as big as three times      

D. as big three times as

以下关于宏的叙述中正确的是______。

A．宏名必须用大写字母表示

B．宏定义必须位于源程序中所有语句之前

C．宏替换没有数据类型限制

D．宏调用比函数调用耗费时间