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：B
use“使用”; convert“使转变，转换······”。store"贮藏，贮备，存储”。receive“接收”。employ本身也有“使用”的意思，所以C项正确。