两则英语谜语（简单．关于动物的）
题目
两则英语谜语（简单．关于动物的）
答案
No.1
I have forests with no trees.
I have cities with no houses.
I have rivers with no water.
What am I ( )
No.2
Two little boats without any sails.With passengers on board.
They don't go on the river or sea .But travel on dry land.
In the day the boats pass to and form.
But at night they are both empty.
What are they?( )
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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