—Where _____ you _____ ?   

—I was looking for my dog everywhere .       [ ]

A. have ; gone

B. have ; been

C. will ; go

D. have ; been to

食品污染根据污染物的性质可分为（）。

A.人为污染

B.生物性污染

C.化学性污染

D.物理性污染