Dogs act like toddlers when you need help - but cats just watch. Scientists compared 3 groups: pet dogs, cats, and human toddlers in an experiment where a human parent hides and pretends to look for an object. 75% of dogs and children helped. Cats only helped if it was in their personal interest.

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典型案例四：长安区君成序一期二标项目

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The feature was first spotted by 9to5Google earlier this week, but it appears to be rolling out on a larger scale.