Miss Smith is a _____ teacher,and we all like her. A friendly B friend C interesting D old
题目
Miss Smith is a _____ teacher,and we all like her. A friendly B friend C interesting D old
答案
Miss Smith is a _____ teacher,and we all like her.
A friendly 正确
B friend 这是个名词
C interesting 因为前面是a不是an
D old 因为前面是a不是an
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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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