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
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
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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