Example:his shoes (dirty) clean
题目
Example:his shoes (dirty) clean
Example:
his shoes (dirty) clean
Are his shoes dirty or clean?
They're not dirty They're clean
1 the children (tired) thirsty
2 grandmother and grandfather( young )old
3 their hats (old) new
4 his cases (heavy) light
答案
四个都是are
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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