3.He started to collect shells about 4 years ago.( 用for about 4 years 替换4 years ago)
题目
3.He started to collect shells about 4 years ago.( 用for about 4 years 替换4 years ago)
答案
He has collected shells for about 4 years.
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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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