单项选择题

Electrical energy may be divided into two components ______ as positive and negative.

A．distinguished
B．specified
C．separated
D．indicated
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单项选择题
I could see a car in the distance, but I couldn't ______ what colour it was.
A．see through
B．make out
C．look out
D．take in
单项选择题
Establishment of a ______ insurance system is essential for economic reforms.
A．accurate
B．sound
C．undisturbed
D．safe
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