单项选择题

The instruction for the imported machines is so ______ that it is impossible for us to operate it.

A．intricate
B．ambiguous
C．duplicated
D．confused
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单项选择题
The captain's confidence during the big storm ______ that the passengers safe.
A．retrieved
B．released
C．reassured
D．revived
单项选择题
Consumer groups have complained that the existing two-company system has led to nearly ______ prices and plans.
A．parallel
B．vertical
C．identical
D．specific
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