Do you know the differences between the new building and the old ones
题目
Do you know the differences between the new building and the old ones
Old buildings 66 brick(砖)and stone walls.The walls hold up the 67 .
In cities,many modern building 68 as if they are made just of windows.Walls of dark glass reach high into the air.Many buildings are 69 than 50 stories(层)tall.
Are walls of glass strong 70 to hold up the new buildings No,The new glass walls do not hold up the buildings,71 they only cover up the frame(框架)made of steel.Have you ever watched a new building going up The steel frame is built 72 .Then the glass walls are hung on the frame.When the building is 73 ,the frame does not show.The outside looks like windows without walls.The glass walls shine 74 the sun with no decoration(装饰).Many people find 75 beautiful just as they are.
答案
have
building
look
more
enough
but
first
finished
in
them
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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