踩踩这些是什么,英语猜谜
题目
踩踩这些是什么,英语猜谜
What has a foot ,but can't walk?what has legs,but can't walk?
what has arms and legs,but can't move?what has no arms ,no legs,and still goes from place to place
答案
1.a mountain；2.desks（tables,beds）；3.chairs,puppets
4.snakes,fish,wind
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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