单项选择题

When we were in the mountains, we often found ourselves entirely enveloped by the fog.

A．confined
B．surrounded
C．darkened
D．blocked
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单项选择题
She was so obstinate that she wouldn' t adjust her opinions.
A．inflexible
B．alert
C．wise
D．talented
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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