科研之友
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<正>Dogs are everywhere! They’re in parks and on the sidewalks. They’re riding in cars and snoozing in the sun. Dogs are the most popular pet on the planet. In fact, they’re the first animals that people ever tamed(驯服). There are some dogs often do very brave things, especially when they work with soldiers. The stories about all these dogs, trained and untrained, are endless. Every day some new story appears about a dog that
