将下列句子改成一般疑问句.
题目
将下列句子改成一般疑问句.
I am a docter.
He read a book yesterday.
He goes to the park on Sundays.
My friend has bought a large house.
He could see some trees here when he was young.
答案
Are you a doctor?
Did he read a book yesterday?
Does he go to the park on Sundays?
Has your Friend bought a large house?
could he see some trees here when he was young?
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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