单项选择题

A．F. O. B price list.
B．An indication of price.
C．I.F.
D．A list of requirements.
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A．A complicated system of several food chains.B．A society that distributes food.C．The relationship of one green plant to another.D．The device that spiders use to catch food.
A．A complicated system of several food chains.
B．A society that distributes food.
C．The relationship of one green plant to another.
D．The device that spiders use to catch food.
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