Techniques to 【employ 】the energy of the sun are
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Techniques to 【employ 】the energy of the sun are being developed.
A. convert
B. store
C. use
D. receive
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答案：C
句意为：人们正在研制开发利用太阳能的技术。convert意为“使转变、转换……”;store意为“贮藏、贮备、存储”;receive意为“收到、接到”。故C项合适。