—Why do you think he can succeed?  

—He believes in himself, ____ is the most important, I think.   [ ]

A. which  

B. what  

C. that    

D. who

“谁污染谁治理”原则属于环境影响评价中的( )政策。

A．污染者负担

B．受益者补偿

C．开发者恢复

D．预防为主、防治结合