【題目】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：昨天我們校長(zhǎng)做了一次關(guān)于環(huán)境保護(hù)的演講，我們學(xué)到了一些關(guān)于廢物回收的知識(shí)。A. on關(guān)于；B. at在；C. to到。on 表示“關(guān)于”，涉及“……專業(yè)領(lǐng)域”。故答案為A。

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