You must keep it in mind that education is the first productivity. A. mildlyB. firmlyC. t

问题补充：

You must keep it in mind that education is the first productivity.

A. mildly

B. firmly

C. tightly

D. roughly

答案：

A. mildly

(答案→)B. firmly

C. tightly

D. roughly

解析：考查副词辨析。根据句意：你必须牢牢记住教育是第一生产力。A温和地，善良地；B坚定地，牢固地；C紧紧地；D粗糙地。所以答案选B。