单项选择题

Who invented the world's first four-wheeled car?
A、Carl Benz
B、Gottlieb Daimler
C、Rudolf Diesel
D、Henry Ford

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单项选择题
边际产量低于平均产量时（）
A.平均产量下降
B.总产量下降
C.平均产量上升
D.总产量上升
多项选择题
Fiction can inspire us, intrigue us, scare us and engage us in new ideas. Some examples of works of fiction are , fairy tales, short stories, and any novels. A、legends B、folk tales C、reports D、 histories
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