all of the questions are easy to answer 同义句 there are no books on the shelf now 同义句
题目
all of the questions are easy to answer 同义句 there are no books on the shelf now 同义句
答案
all of the questions are not difficult to answer
there aren't any books on the shelf now
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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