how does the author introduce the topic of this essay这道书面表达题怎么回答?
题目
how does the author introduce the topic of this essay这道书面表达题怎么回答?
答案
The author introduces the topic of this essay in the following ways:
First of all,he briefly shows us the topic by asking a question.
Then,he explains the topic from different aspects with examples and facts.
Finally,he sums up the whole passage and summarises the main idea of the topic.
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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