Healthy food and drink作文,
题目
Healthy food and drink作文,
答案
Eating healthy food and drink are good for us.I think we should eat more vegetables and eat less meat.That can make us be very healthy and strong.And for drink,I think we should drink more milk and wa...
举一反三
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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