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
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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
单项选择题
No other newspaper columnist has managed as yet to rival Ann Landers' popularity in terms of readership.
A．though
B．in spite of this
C．even
D．so far
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