单项选择题

Techniques to employ the energy of the sun are being developed.

A．convert
B．store
C．use
D．receive
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单项选择题
He works in a sports centre instructing people in the use of the gym equipment.
A．helping
B．teaching
C．informing
D．ordering
单项选择题
The workers finally called off the strike.
A．put off
B．ended
C．cancelled
D．participated in
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