单项选择题

"Millions do it" In this sentence "do it" refers to _______.

A．feeling uncomfortably not on the equator
B．flying over the North Pole
C．flying over the equator
D．making homes on the equator
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单项选择题
Airplanes usually do not need to climb quickly or fly high in the polar region because _______.
A．they do not land them
B．there are not clouds at all
C．they can cross the ice with special equipment
D．it is very cold
单项选择题
Airplanes can climb quickly _______.
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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