单项选择题

It is said that science has become too complex to acknowledge the existence of universal truths.

A．address
B．declare
C．affirm
D．perceive
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单项选择题
In the country we are excluded from the worries of life in a big town.
A．enveloped
B．protected
C．insulated
D．subtracted
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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