填空题

In history human beings, as well as many other things, have served as money.

【参考答案】

Y

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填空题

This passage gives a general description of the development and functions of currency.

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名校校园正成为旅游新热点2．校园是否应对公众开放，人们看法不同3．我认为… Should the University Campus Be Open to Tourists