单项选择题

商品的边际替代率递减规律决定了无差异曲线______。 A．凸向原点 B．凹向原点 C．垂直于横轴 D．平行于横轴

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单项选择题

Among all the famous sayings of antiquity, there is none that appeals to the author _____________ than Diogenes’ proud announcement that he was a citizen of the world.( ) A. better B. best C. deeply D. nicely

不定项选择

‏。

A．错误
B．正确