初三英语作文你上周去孤儿院当志愿者的经历,是给校刊写
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初三英语作文你上周去孤儿院当志愿者的经历,是给校刊写
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I went to the orphanage to be a volunteer with my classmates last week. We set out early at about 7:00 in the morning. It took us about half an hour to get there by bus. The children welcomed us happi...
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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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