如何保持健康英语作文50词
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如何保持健康英语作文50词
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How to eat healthily?What should we eat to have a balaced diet?We should eat plenty of vegetables.We should eat three meals a day .We should eat plenty of rie.I think you will be healthy soon!Then you...
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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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