—Look ______ the two children, they're Nick and Lily.

—Oh, they're twin ______. [ ]

A. at; brother and sister

B. /; brothers

C. of; sisters

D. after; boys

下面的函数调用语句中，func函数的实参个数是______。
func(f2(v1,v2),(v3,v4,v5),(v6,max(v7,v8)));

A) 3
B) 4
C) 5
D) 8