When addressing an audience that already agrees with you, the most appropriate persuasive purpose for

In the 1950s the base that had been used for the earliest film stocks was replaced with cellulose nitrate, a substance that is highly flammable but sturdier than what was in use before

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Political scandals erupted in 2005 after it became known that political commentators were paid by the Bush administration to make positive statements and to write positive op-eds on the administration's initiatives

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