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Где синтезируется витамин А у человека ?

Перевести текст: Mark Twain, the famous American writer, was well-know as a lecturer. Literary clubs often invited him to speak. Before one of his lectures a club member came to him and said: "Mr  Twain, people say that you tell very funny stories. I hope that during your lecture you will tell a story that will make my uncle laugh. He hasn`t laughed for ten years".