songs of the birds还是 the songs of the birds 还是 song of the birds 还是the song of the birds
题目
songs of the birds还是 the songs of the birds 还是 song of the birds 还是the song of the birds
是 songs of the birds
还是 the songs of the birds
还是 song of the birds
还是the song of the birds 无限个问号.
到底定冠词 要不要复数
答案
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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