猜猜这些是什么?
题目
猜猜这些是什么?
1.What has a foot,but can't walk?It's a ____________.
2.What has legs,but can't walk?It's a _____________.
3.What has arms and legs,bust can't move?It's a ____________.
4.What has no arms,no legs,and still goes from place to place?
It is _____________.
答案
walkstick
desk
dead people
plane
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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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