Many countries are now setting up national parks animals and plants can be protected. (2013·北京，27)
A. when
B. which
C. whose
D. where
网友回答
A. when
B. which
C. whose
D. where
解析：D
解析 考查定语从句。句意为：眼下，很多国家正在建立一些国家公园，动物和植物在那儿可以得到保护。先行词为national parks，且定语从句中缺少地点状语，故用where引导，相当于in which。