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
It is said that science has become too complex to acknowledge the existence of uni versal truths.
A．address
B．declare
C．affirm
D．Perceive
单项选择题
We are totally unable, after decades of experiment, to replicate ancient glazed pottery.
A．produce
B．manufacture
C．dramatize
D．duplicate
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