I think Austria is the most beautiful country,and Japanese girls are the most lovely.
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I think Austria is the most beautiful country,and Japanese girls are the most lovely.
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I think the most useful invention in the world so far is internet. We can search for information we need in the internet, knowing more about the world. It makes life more convenient. We can do merely ...
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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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