giving a helping hand as a volunteer文章（200字以上
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giving a helping hand as a volunteer文章（200字以上
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关于奥运会的
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am a volunteer The Olympic Games will be opened up just after a month in 2008.Toady is the volunteer recruited day.I got up earlier than before,after breakfast,walked to the Olympic Village full of en...
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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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