单项选择题

Crew chiefs supervised engines, switches and lights that told them how each item of equipment was functioning.

A．observed
B．preserved
C．monitored
D．nurtured
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单项选择题
A shift from native bronze to iron artifacts took place under the influence of cultural borrowings.
A．transition
B．transmission
C．transaction
D．transference
单项选择题
In view of obstruction and disappointment, the prime minister decided to make parliamentary alliance.
A．frustration
B．illustration
C．capitulation
D．clarification
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