The students___the books out of the school reading room
题目
The students___the books out of the school reading room
A.allow to take B.aren't allowed to take C.are allowed to take
D.aren't allowed taking
答案
B或c!be allowed to do something 允许做什么!
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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