单项选择题

This type of chair, easily______or folded away, is ideal for use in the garden.

A．put out
B．put in
C．put up
D．put forth
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单项选择题
The company's training plan was designed to help the employees to improve their work habits and______.
A．proficiency
B．sufficiency
C．insufficiency
D．efficiency
单项选择题
The laser represents a true marriage between science and technology, the men who devised it were______engineers and physicists.
A．spontaneously
B．simultaneously
C．instantaneously
D．homogeneously
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