The IPCC announcement three years ago that "most of the warming observed over the last 50 years is" ______.

A．possibly due to human activities

B．possibly because human activities

C．due to likely human activities

D．human activities likely attributable

程朱理学与陆王心学的主要分歧在于（）

A.是否遵循“三纲五常”，维护社会秩序

B.“理”是否是世界万物的本原

C.是否继承孔孟正宗以治理国家

D.“格物致知”与“发明人之本心”的矛盾