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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单项选择题
The energy companies ______ urgent studies of the Arctic environment.
A．made
B．put
C．moved
D．launched
单项选择题
Although I tried to concentrate on the lecture, I was ______ by the outside noise.
A．confused
B．distracted
C．attracted
D．refused
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