单项选择题

According to the passage, which of the following was the earliest kind of ’exchange of wealth（）

A．Bartered goods.
B．Fiat money.
C．Coin currency.
D．Intangible forms.

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单项选择题

From the passage we can see that astronomy is （）

A．the life experience of great men
B．the movement of the stars and the planets
C．the scientific study of natural objects in space
D．the theories developed by scientists of old times

单项选择题

21（）

A．failed
B．wrote
C．received
D．chose