Dogs have been man's good friends for t______ of years.Many stories told how brave dogs helpedpeople in t______.With the help of dogs,many people l______ in snow found their way home.Dogs have also helped in many scientific researches(科学研究).T
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![Dogs have been man's good friends for t______ of years.Many stories told how brave dogs helpedpeople in t______.With the help of dogs,many people l______ in snow found their way home.Dogs have also helped in many scientific researches(科学研究).T](/uploads/image/z/7013960-8-0.jpg?t=Dogs+have+been+man%27s+good+friends+for+t______+of+years.Many+stories+told+how+brave+dogs+helpedpeople+in+t______.With+the+help+of+dogs%2Cmany+people+l______+in+snow+found+their+way+home.Dogs+have+also+helped+in+many+scientific+researches%28%E7%A7%91%E5%AD%A6%E7%A0%94%E7%A9%B6%29.T)
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