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：exam资讯

青瓦台一名不愿透露姓名的官员说，如今这套房正在出租，租约仍在有效期内。

2️⃣ 选择排序 (Selection Sort)

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早报｜苹果下周一发布

She's the astronaut who smashed through the glass ceiling. And kept on going.