He writes to me every three months (改为同义句） He writes to me____ _____ two months
题目
He writes to me every three months (改为同义句） He writes to me____ _____ two months
答案
every other
every + n = every other (n-1)
所以：every three=every other two
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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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