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【题目】A scientist and inventor (is /are) giving a speech.

【答案】is
【解析】句意:一位科学家和发明家正在发表演说。a scientist and inventor 指的是一个身兼两职的人,是一个人,所以谓语动词要用单数形式;如果是a scientist and an inventor就是一位科学家和一位发明家二个人,故选is。

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