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Do you know the differences between the new building and the old ones?
Old buildings h 1 brick(磚)and stone walls. The walls hold up the b 2 .
In cities, many modern building 1 3 as if they are made just of windows.Walls of dark glass reach
high into the air. Many buildings are m 4 than 50 stories(層)tall.
Are walls of glass strong e 5 to hold up the new buildings? No, The new glass walls do not hold up
the buildings,b 6 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 f 7 . Then the glass walls are hung on the frame. When the
building is f 8 , the frame does not show. The outside looks like windows without walls. The glass walls
shine i 9 the sun with no decoration(裝飾).Many people find t 10 beautiful just as they are.