It is important to know about the cultural differences that cause problemsA. mustB. mayC.

问题补充：

It is important to know about the cultural differences that cause problems．

A. must

B. may

C. dare

D. shall

答案：

A. must

(答案→)B. may

C. dare

D. shall

解析：考查情态动词辨析。Must必须；may也许；dare敢于；shall表示命令，允诺，要求；句意：了解那些也许导致问题的文化差异很重要。根据句意说明B正确。