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单项选择题
A．Because there planes fly higher than at the equator.B．Because there the eyes can reach about 4,000 metres.C．Because there planes are clear of bad weather.D．Because there planes fly more quickly than at the equator.
A．Because there planes fly higher than at the equator.
B．Because there the eyes can reach about 4,000 metres.
C．Because there planes are clear of bad weather.
D．Because there planes fly more quickly than at the equator.
单项选择题
A．At low latitudes.B．At mid-latitudes.C．At high latitudes.D．At high altitudes.
A．At low latitudes.
B．At mid-latitudes.
C．At high latitudes.
D．At high altitudes.
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