Techniques______the energy of the sun are being developed.

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问题 Techniques______the energy of the sun are being developed.

选项 A、harnessing
B、aiming
C、assisting
D、attempting

答案A

解析 harness"治理,利用";aim(at)"志在;旨在;瞄准,针对";assist"帮助,援助";attempt"试图,努力"。根据题意答案应为A,意为:"人们正在开发治理太阳能的技术。"
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