请用所给词的正确形式填空
题目
请用所给词的正确形式填空
1.He___(exercise)there or four times a week.
2.Do you____(clean)you room by yourself?
3.What time dose he usually____(practice)his guitar?
答案
1.He_exercises__(exercise)there or four times a week.2.Do you_clean___(clean)you room by yourself?3.What time dose he usually_practise___(practice)his guitar?
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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