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

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

选项 A、convert
B、store
C、use
D、receive

答案C

解析根据句意(人们正在研制开发……太阳能的技术。)判断C合适。convert vt．“使转变，转换……”；store vt．“贮藏，贮备，存储”n．“商店，店铺，贮藏”。

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