她在入园前，已经可以自己穿脱衣服、鞋子、手套、帽子这些事情了。
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John Harp was able to identify the type of brick in the wall shown behind Lucy
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.
· 马琳 · 来源：haerbin资讯