— That's the third time he's won the award in this field.   

— Yes. He ________ his maximum potential in the past decade. [ ]

A. explored          

B. is exploring  

C. has been exploring  

D. has explored

下列有关日常生活中的做法，错误的是（）

A.夏天在烈日下运动时，为预防中暑可以多喝糖水

B.做菜时为减少碘的损失，可以在菜出锅时加碘盐

C.储存土豆时，不宜放在通风处

D.相对有机食品而言，更应该多吃无公害食品