有些经营汽车的跨国公司兼并摩托车企业，生产摩托车，实行的是（ ）。
A. 专业化发展
B. 同心多样化
C. 水平多样化
D. 混合多样化
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人体的热能来源于膳食中蛋白质、脂肪和碳水化合物，它们在体内的产热系数分别为（）
A. 4kcal/g、9kcal/g、9kcal/g
B. 4kcal/g、9kcal/g、4kcal/g
C. 9kcal/g、4kcal/g、4kcal/g
D. 4kcal/g、4kcal/g、9kcal/g
The author's primary purpose in the passage is to______.
A. clarify the kinds of understanding an adolescent must have in order to develop a political ideology
B. dispute the theory that a political ideology can be acquired during adolescence
C. explain why adolescents are generally uninterested in political arguments
D. suggest various means of encouraging adolescents to develop personal political ideologies
Which of the following events was the revival of classical literature and artistic styles in European history
A. The Enlightenment.
B. The Glorious Revolution.
C. The Restoration.
D. The Renaissanc
根据《宪法》，下列有权提议修改宪法的主体是()。
A. 中共中央
B. 全国人大常委会
C. 国家主席
D. 全国人大主席团
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