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【题目】Yesterday our headmaster made a speech ______ environmental protection, and we learned something about recycling of waste.

A. onB. atC. to

【答案】A

【解析】

句意:昨天我们校长做了一次关于环境保护的演讲,我们学到了一些关于废物回收的知识。A. on关于;B. at在;C. to到。on 表示“关于”,涉及“……专业领域”。故答案为A

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