一道完形求速度,在等
题目
一道完形求速度,在等
When you are in a very dangerous situation and feel afraid ,the body automatically produces a chemical calledadrenalin in the blood.With adrenalin in the blood system,
youactually feel stronger an stronger and are 37 to fight or run away.
37.A.ready B.unable C.afraid D.anxious
答案
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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