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.

· · 来源：food资讯

Drumroll, please!

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Planning to switch fields? Be bold, know your limits and choose your institution wisely, say three UK research leaders.

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（三）被处罚人在当地没有固定住所，不当场收缴事后难以执行的。