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Why did david smith burnish the surface of his work cubi xix?

Make the correct match. 1. only the collection of the louvre is on display. 2. in addition to being a museum, the louvre has also been a 3. the present palace was built to display 4. after the french revolution, it became a 5. in 1989 i.m. pei designed for a new entrance. 6. pei's design actually has 7. the new entrance was required to handle the growing number of half the royal art collections public museum 673 panels the glass pyramid prison visitors

Need some ! asap i need to figure out 3 major changes in bridges over time and why these changes to adapt to both improvements in technology and changing social links would also alot.