1、R________to close the windows when you go out.
题目
1、R________to close the windows when you go out.
2、It is d______to play football on the street.
3、He opened his eyes w_____in surprise.
4、My dog is very strong and w____over 20 kilograms.
答案
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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