-________your cousin Andy good at football?-Yes.He often plays it.A.Is.B.Are
题目
-________your cousin Andy good at football?-Yes.He often plays it.A.Is.B.Are
-________your cousin Andy good at football?
-Yes.He often plays it.
A.Is.B.Are C.Does D.Do
答案
A be good at擅长做某事 又是一般现在时
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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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