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
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单项选择题
Establishment of a ______ insurance system is essential for economic reforms.
A．accurate
B．sound
C．undisturbed
D．safe
单项选择题
The energy companies ______ urgent studies of the Arctic environment.
A．made
B．put
C．moved
D．launched
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