One of my best friends 作文,
题目
One of my best friends 作文,
答案
Ben is my best friend.He loves sports very much.He is good at Math and English.He is a good boy.He always helps other students.Now,he is the tallest in our class.In 15 years’ time,he will be taller a...
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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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