Most economists agree that nations gain b
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Most economists agree that nations gain by trading with one another.
A:rely B:work C:prove D:profit
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答案：D
本题考查的是对动词的认知。这句话的意思是：大部分经济学家们认同国家之间的贸易使各国受益。gain的意思是获得。A.rely依靠，B.work工作；C.prove证明；D.profit获利，例如：He has profited by selling his holdings to other investors．他将自己的股票卖给其他投资者，从中获利。gain和profit意思最接近，所以选D。