单项选择题

变色镜片从材料分，主要分为树脂变色和玻璃变色。
A、正确
B、错误

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多项选择题

多选（3分）思想品德课的“内容活动化”指的是
A、教学中要将思想品德课的内容通过活动呈现
B、通过活动增加教学趣味性
C、让学生通过各种自主活动理解课程内容
D、让学生通过自主活动自己得出结论

单项选择题

Economics is best defined as the study of ( )

A．how society manages its scarce resources.
B．how to run a business most profitably.
C．how to predict inflation, unemployment, and stock prices.
D．how the government can stop the harm from unchecked self-interest.