why did people long ago often eat more food than they needed?
题目
why did people long ago often eat more food than they needed?
why did people long ago often eat more food than they needed -- that is, they did they sometimes overea?
答案
为什么以前的人们总是吃饱后还要再吃呢?换句话说,为什么他们有时候会吃得过量呢?
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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