— I lost my cell phone yesterday. Can you tell me ________ I can buy one?

— Well,there is a department store just around the corner. [    ]

A. whether  

B. what

C. where  

D. when

关于分子生物学测定细胞因子的评价，哪项正确（）

A.特异性高

B.敏感性高

C.测细胞因子基因

D.操作简便

E.定量