2. We must know the of other countries so that they will not think us ill-mannered.A. cu

问题补充：

2. We must know the of other countries, so that they will not think us ill-mannered.

A. customs

B. habits

C. manners

D. hobbies

答案：

(答案→)A. customs

B. habits

C. manners

D. hobbies

解析：可联系答.案.网客服索取。