用yesterday改写下列句子
题目
用yesterday改写下列句子
1.I am happy every day.
2.Jim always walks to school.
3.Danny breaks his tail.
4.He is talking to his teacher.
答案
1.I was happy yesterday. 2.Jim walked to school yesterday. 3.Danny broke his tail yesterday. 4.He was talking to his teacher yesterday.
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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