behaviour到底可数吗为什么可以用 bad behaviours呢
题目
behaviour到底可数吗为什么可以用 bad behaviours呢
到底什么时候可以用复数的啊
如I was scolding him for his bad behaviours at school.
答案
不可数的...His friendly behaviour was a cloak for his evil intentions；Everyone condemned his foolish behaviour...
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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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