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.
单项选择题
A．Because city-dwellers are obliged to adopt a wholly unnatural way of life.B．Because the sun was hidden from view by tall buildings.C．Because the noise made by traffic never stops.D．Because large modern cities are too big to control.
A．Because city-dwellers are obliged to adopt a wholly unnatural way of life.
B．Because the sun was hidden from view by tall buildings.
C．Because the noise made by traffic never stops.
D．Because large modern cities are too big to control.
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