单项选择题

Chimpanzees are frequently used as stand-ins for human beings in experiments.

A．partners
B．role-models
C．stand-bys
D．substitute
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单项选择题
The plainer 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
单项选择题
Adverse reviews in the New York press may greatly change the prospects of a new Broadway production.
A．additional
B．encouraging
C．unfavorable
D．subversive
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