The invention of balloon-frame construction came about with the development of __________

A. mass-produced nails
B. hot-air balloons used to lift the roof timbers
C. concrete
D. wide, hand-cut lumber

A

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Easter Island figures are called moai

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China's earliest and most important musical instrument was the

A. Diatonic drum. B. Flute. C. Zither. D. Bell.

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