单项选择题

Cowries shells were once in widespread use as a token of value.

A．a symbol
B．an amount
C．a thing
D．an investment
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单项选择题
Chimpanzees are frequently used as stand-ins for human beings in experiment.
A．partners
B．role-models
C．stand-bys
D．substitutes
单项选择题
The plainer is a bowerbird's plumage, the more brightly it decorates its nest to attract a mate.
A．more spectacular
B．duller
C．flatter
D．more melancholy
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