Rock-climbing is a breathtaking activity, very popular nationwide among young people, ______ cooperation as well as courage plays an important role.

A．who

B．where

C．which

D．of which

用户用计算机高级语言编写的程序，通常称为

A．汇编程序

B．目标程序

C．源程序

D．二进制代码程序