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．substitute
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单项选择题
A number of animals in Aesop's fables are portrayed as being crafty.
A．vain
B．virtuous
C．artistic
D．cunning
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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