以what do you think it the most serious challenge of living in a big city为话题,写一篇英语对话.要求两人对话,80字以上
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以what do you think it the most serious challenge of living in a big city为话题,写一篇英语对话.要求两人对话,80字以上
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应为:what do you think is the most serious challenge of living in a big city?A:So crowed the street is !I'm afraid we'll be late for work again.B:I'm afraid so.I think traffic is the most serious cha...
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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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