the cup_glass and there is a flower in it A.is made from B.is made of C.is made into D.is made by
题目
the cup_glass and there is a flower in it A.is made from B.is made of C.is made into D.is made by
答案
B make of 你能看见的材料,玻璃能直接看见.A是看不出的制造,抽象的.C做成什么.D被谁做的
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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