请用英文介绍一种食物．介绍历史、生长过程、作用等,大概100个词左右
题目
请用英文介绍一种食物．介绍历史、生长过程、作用等,大概100个词左右
答案
The potato was first cultivated in South America between three and seven thousand years ago, though scientists believe they may have grown wild in the region as long as 13,000 years ago. According to ...
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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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