求一篇关于“空巢老人”的英语短文100词
题目
求一篇关于“空巢老人”的英语短文100词
答案
With the steady development of China's economy and the continuous improvement of people's living standards,making aging more serious situation.The problems of the elderly society has gradually become ...
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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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