This is an useful book .You had better read it carefully 此句有一个错误 请找出来
题目
This is an useful book .You had better read it carefully 此句有一个错误 请找出来
十万火急 八百里加急啊
答案
This is a useful book .You had better read it carefully.
an改为a ,因为useful是辅音 /j/ 开头.
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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