(2013·四川，9)Nowadays people are more concerned about the environment they live.
A. what
B. which
C. when
D. where
网友回答
A. what
B. which
C. when
D. where
解析：考查定语从句。此处先判断从句类型为定语从句，先行词为the environment，定语从句中live为不及物动词，因此不缺少主干成分，应填关系副词；且先行词environment指地点，故用where，相当于in which。