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．discerm
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单项选择题
Giving the child problems he cant solve will only frustrate him.
A．baffle
B．worry
C．alarm
D．cultivate
单项选择题
The environmental balance among ecological communities is exceedingly complex.
A．almost
B．successfully
C．extremely
D．rarely
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