简述水土保持林对降雨的再分配作用？
参考答案：
A.林冠层对降水的截留作用；
B.枯枝落叶层对降雨的截留作用。
I remember my daughter used to ask some questions that girls ____ would ask.
A．twice her age
B．twice so old as she
C．as twice old as her
D．twice as old as her old age
固态金属根据扩散过程中是否发生浓度变化分为（）。
A.原子扩散与反应扩散
B.自扩散和互扩散
C.下坡扩散与上坡扩散
