填空题

Prices reach a certain level at which quantity demanded is equal to quantity supplied.

【参考答案】

在这种价格水平下，供需数量达到相等。

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热门试题

单项选择题

It would appear that the public Sagan hopes to attract （）

A．are interested in UFO spotting
B．are only interested in science fiction
C．are unable to write science fiction
D．have a reasonable grounding in science

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How much does Sagan ,think America should spend on Space Exploration（）

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B．Less than she does at present.
C．As much as England did in the sixteenth century.
D．All of her gross national income.