___ the beginning of the meeting, the president made a speech ___ how to reduce pollution.
A．a(chǎn)t; inB．a(chǎn)t; onC．in; onD．on; on
B解析:
固定搭配at the beginning of在…的起初。on表示關(guān)于某種問題。
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科目：初中英語 來源：同步題 題型：填空題

用所給單詞的適當形式填空。
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6. He is a______(luck) boy.
7. Thank you for______(help) me.
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