单项选择题

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

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

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单项选择题
The expression play safe probably means ()

A. to write carefully
B. to do as teachers say
C. to use dictionaries frequently
D. to avoid using words one is not sure of
单项选择题
How was Ann sitting before the plane took off()

A. With her arms folded.
B. With her seat belt undone.
C. Holding tight to her seat belt.
D. Holding on to part of the seat.
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