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
During the past ten years there have been dramatic changes in the international situation.
A．permanent
B．powerful
C．striking
D．practical
单项选择题
A new system of quality control was brought in to overcome the defects in the firm's products.
A．invested
B．introduced
C．installed
D．insisted
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