单项选择题

A．Brazil.
B．Argentina.
C．Chile.
D．Ecuador.
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单项选择题
A．In warm air.B．In cold airC．When it reaches the polar region.D．Only when the clouds are down low.
A．In warm air.
B．In cold air
C．When it reaches the polar region.
D．Only when the clouds are down low.
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