单项选择题

A．Tidy.
B．Messy.
C．Well-made.
D．Bright.
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单项选择题
A．The development of balloons.B．The weather balloons.C．The history of human being flying.D．Balloons for recreation.
A．The development of balloons.
B．The weather balloons.
C．The history of human being flying.
D．Balloons for recreation.
单项选择题
A．Magnesium.B．Limestone.C．Carbon.D．Water.
A．Magnesium.
B．Limestone.
C．Carbon.
D．Water.
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