Many people gave money and food to c____ after the earthquake in Yingjiang Yunnan.
题目
Many people gave money and food to c____ after the earthquake in Yingjiang Yunnan.
答案里面是charities,但是课本里有give it to charity为什么这里是单数呢?是固定搭配吗?
还有一个，keep sb.out 是不是“ 不让某人进去” 的意思？
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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