将下列汉语转化为英语.
题目
将下列汉语转化为英语.
4,他走了已经五天了.5,我去过两次北京.6,tom在哪儿呢? 他去医院了.7,我已经对英语感兴趣了.
答案
4 He has been away for five days .5 I have been to Beijing twice .6 Where is Tom He has gone to hospital .7 I have already been interested in English .→→→→→→→→→→→→●←←←←←←←←←←←...
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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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