小学六年级英语作文写一写你及你家长的假期计划
题目
小学六年级英语作文写一写你及你家长的假期计划
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Happy holidayDuring the holidays,there was a lot of fun,happy to catch fish in the creek is only one interest in.One evening,my father and I happy to hometown streamshade,one to the brook,I am unable ...
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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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