科研之友
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摘要
<正>An old fisherman was fishing in the lake one day.He saw a water snake in the water with a frog in its mouth.一天,一位老渔夫正在湖里钓鱼,他看见水里有一条水蛇,它嘴里叼着一只青蛙。He had been a fisherman for a long time.He knew the best food for some large fish were frogs.With this thought,the fisherman took the snake from behind and carefully took the frog out of its mouth.He put the frog in his side bag.
