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
It is delight to fly at the Pole because there _______.
A．planes fly higher than at the equator
B．the eyes can reach about 4,000 meters
C．planes are clear of bad weather
D．planes fly more quickly than at the equator
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
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