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
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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
单项选择题
Although students may be in a______position, teachers shall treat them as equals.
A．subsidiary
B．submarine
C．subordinate
D．subsequent
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