It is well-known that vegetables______a great deal of vitamin ,which is very useful to us
题目
It is well-known that vegetables______a great deal of vitamin ,which is very useful to us
A.include B.keep C.contanin D.cover
答案
c.contain
众所周知,蔬菜富含对人体有益的维他命
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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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