关于转基因食品（或植物,动物等）的利弊分析的英语作文
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Dogs have been domesticated for most of human history and have thus endeared themselves to many over the years.Stories have been told about brave dogs that served admirably in war or that risked their lives to save persons in danger.When Pompeii--the Roman community destroyed by Mount Vesuvius in AD 79--was finally excavated,searchers found evidence of a dog lying across a child,apparently trying to protect the youngster.Perhaps few of the millions of dogs in the world may be so heroic,but they are still a source of genuine delight to their owners.
