英语改错 1.There are too much students in the classroom 2.Mary is good on history
题目
英语改错 1.There are too much students in the classroom 2.Mary is good on history
答案
there are too many students in the classroom mary is good at history
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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