---Where did you get the dictionary?

--- From the library. And I have ______ it for two weeks.

A．borrowed

B．lent

C．kept

D．bought

有利于保护我国西北地区生态环境的行为是[ ]

A．经营管理粗放

B．超载放牧

C．盲目开垦

D．退耕还林还草