英语,补全对话（有3项多余）
题目
英语,补全对话（有3项多余）
A：Hello,Mona.——
B：It's a case.
A：——
B：No,she isn't.She is my cousin.
A：——
B：545-3209.
A.What's in it?
B.What's this?
C.Is this girl your sister?
D.What's her telephone number?
E.Is this your case?
F.Can you spell it?
G.What color is it?
答案
B.What's this?
C.Is this girl your sister?
D.What's her telephone number?
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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