水源涵养林的最佳林型是什么？
参考答案：
异林复层针阔混交林。
It is said that many kids are worried about the year 2012, ____they think the earth will be destroyed
by disasters. [ ]
A. when
B. where
C. as
D. which
贯彻“三个代表”重要思想，关键在（），核心在，本质在（）。
