以下函数调用语句中含有参数的个数是（ ）。　　excc((v1，v2)，(v2，v3，v4)，v6)；

A．3

B．4

C．5

D．6

Google’s latest efforts to establish an online reading service might have the biggest impact because:

A．it will use a search engine with the fastest speed.

B．it will put into its search engine a large number of books hardly available otherwise.

C．it is famous for its search engine which is accurate and easy to use.

D．it will put into its search engine the most extensive materials ever known to have been scanned.