题目内容
Whether a situation is ongoing or completed, repeated or habitual comes under the heading of aspect, which can be thought of as the aspect or view which a speaker offers of a particular situation.
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The location of a situation in past, present or future time, or of two situations relative to each other in time, comes under the heading of tense.
The table is smiling is a grammatically well-formed sentence.
商品的边际效用与价格之比，如下哪种说法是正确的：
如果消费者面临的效用函数用U=XY表示（这表明X的边际效用等于Y，而Y的边际效用等于X），X和Y的价格分别为10和20，收入为100。则消费者最优选择为：
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