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The hot-air balloon launched by the Montgolfier brothers in 1783 was the ___ of the modern airplane. A. precursor B. conglomeration C. valor D. celerity

User Turtledove
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The correct answer is A - precursor, meaning to come before (person or thing). The key is the prefix "pre" which literally means came before or previous to. 
User Nilay Mehta
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