阅读理解 Many people like to travel by plane,but I don’t like it because an airport is usually far from
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阅读理解 Many people like to travel by plane,but I don’t like it because an airport is usually far from the city.You have to get there early and wait for hours for the plane to take off and it is often late.You can’t open the windows.You can’t choose the food.Planes are fast,but they still take hours to go out of the airport and into the city.I like travelling by train.I think trains
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举一反三
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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