单项选择题

General acceptance of 3-D films may prove hard to come by, as the experience of three decades ago indicated.

A．obtain
B．explain
C．understand
D．discern
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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
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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