单项选择题

Recent research into aging suggests that the body' s defense mechanisms may lose the abili ty to distinguish what is alien.

A．insane
B．infectious
C．foreign
D．poisonous
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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
In ancient Egyptian paintings, royal figures were differentiated by making them several times larger than others.
A．distinguished
B．estranged
C．deferred
D．enlarged
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