写一篇英语日记,
题目
写一篇英语日记,
要点：1,5月29日,星期六,天气晴朗 2.我们从上午六点出发乘火车九点到北戴河3.上午,我们在沙滩上做游戏,在饭店吃饭,下午我们沿海边步行去南戴河,照相4.下午五点半返校.
答案
May 29, Saturday, sunny we got on the train at six o'clock and arrived at Beidai River at nine am.we had a wonderful time here. we played games on the beach and everyone got himself indulged in the ...
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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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