单项选择题

Learning to use computers is what we want to ______ from the program.

A．help
B．make
C．aid
D．benefit
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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
Good lighting in factories leads to greater comfort, higher ______ and productivity.
A．work
B．proficiency
C．craft
D．efficiency
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