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__
D
33. Historians believe that some forms of an advertising must be as old as barter and
__________________________
A BC D
trade.
34. Although fluorine tests and x-ray analyses, archaeologists can prove the validity of
_______ __________ _____
A BCD
artifacts.
35. Dams are used to control flooding, provide water for irrigation, and generating
______________________
A BC
electricity for the surrounding area.
___
D
36. The development of photographic techniques and equipment provided an important
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