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单项选择题

以下哪种父母教养方式最适合营造开展性教育的氛围

A．专制型
B．权威型
C．放任型
D．忽视型

判断题

Trade need not be the result of comparative advantage. Instead, it can result from increasing returns or economies of scale, that is, from a tendency of unit costs to be lower with larger output.
A、正确
B、错误