单项选择题

What was the most wonderful piece of machinery on show

A．6,000.
B．60,000.
C．6,000,000.
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单项选择题
A．About how to make films.B．About the earliest films.C．About the prices for different firms to make films.
A．About how to make films.
B．About the earliest films.
C．About the prices for different firms to make films.
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