单选题 As the society has rigid social ______, everyone knows his role in the society.
A. hemisphere B. contempt C. controversy D. hierarchy

【正确答案】 D

【答案解析】[解析] 从句意“因为社会等级森严，人人都知道自己在社会中的角色”可知，hierarchy“层次，层级”是正确答案。如：The government is a hierarchy．政府是个官阶分明的统治集团。而hemisphere“半球”；contempt“轻视”；controversy“争论”都无此意，所以正确答案为D。