The radio club in our school, which is in _____ charge of Hao Zhe, is much more than just ____ music for everyone.

A．/; /

B．/; the

C．the; /

D．the; the

读“黄土高原环境问题成因示意图”。图中①②两个自然原因是

A．土质疏松,过度放牧

B．降水集中,过度垦荒

C．土质疏松,降水集中

D．植被破坏,垦荒造田