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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.
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单项选择题A．The people are not in regular communication with the rhythm of nature.B．The people can’t enjoy sunshine and fresh air.C．Modern cities offer better schools, more chances of employment.D．Traffic fumes pollute the air.

A．The people are not in regular communication with the rhythm of nature.
B．The people can’t enjoy sunshine and fresh air.
C．Modern cities offer better schools, more chances of employment.
D．Traffic fumes pollute the air.

单项选择题A．It is a good place to land at by aeroplane.B．It is a good place to fly over.C．It is a good place to travel to by land.D．It is a good place to live at.

A．It is a good place to land at by aeroplane.
B．It is a good place to fly over.
C．It is a good place to travel to by land.
D．It is a good place to live at.