She studies very hard though she is still rather weak
题目
She studies very hard though she is still rather weak
You shouldn't go home unless you are allowed.
Every patient has to wait outside thereare called for.
答案
she studies very hard.
she is still rather weak.
you shouldn't go home.
you are allowed
every patient has to wait outside.
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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