芦山地震导致部分地区山体滑坡，许多动植物被掩埋死亡。这一事例说明

A．生物适应环境

B．生物影响环境

C．环境影响生物

D．环境适应生物

—Have you ever been to Qufu?

—Yes. I went there last year. It's a very _______ place.        [ ]

A. educational  

B. dangerous    

C. difficult      

D. delicious