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：answer资讯

本届大会将邀请近500家国内外知名企业参加，有戴尔、阿斯利康、GE、赛诺菲、海尔等行业龙头企业，也有博枫资产、KKR、启明创投等知名投资机构，还有MiniMax、追觅科技、地平线等新锐创新力量。

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双方在医院附近谈妥了价格——20元。我特意在网络上查询了当时的物价，1970年代，猪肉约0.9元/斤，因此20元相当于现在的‌3200元至4000元‌。