I would like to buy a book in history.该错
题目
I would like to buy a book in history.该错
答案
改为I would like to buy a history book.
其实楼上的可能是对的,I would like to buy a book about history.（about关于）它等同于上面的句子!
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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