GRE 选词填空,
题目
GRE 选词填空,
As the world has moved into a scientific age,the origin of herbal medicine in
many countries remains _____ in mystery and often sounds fantastic to those
trained in modern science.
A.shrouded B.hidden C.covered D.hindered
为什么选B不对?
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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