Rock-climbing is a breathtaking activity, very popular nationwide among young people, coo

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A. who
B. which
(答案→)C. where
D. of which
解析：
试题分析:考查定语从句。从结构判断     cooperation as well as courage plays an important role.是间隔性定
语从句，修饰先行词activity，因为定语从句中主谓宾全，所以缺少状语，选项中只有where 是关系副词可
以做状语，所以正确答案是C。句意：攀岩是一项极为刺激的活动，在全国范围内受到青年人的欢迎，在这
项运动中合作和勇气都起着重要作用。