单项选择题

In July Guangzhou Baiyun International Airport resumed its international service to ______.

A．the whole world
B．only four southeastern nations
C．the Southeast Asian nations
D．all Asian nations
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单项选择题
According to the theory of photo-periodism, ______.
A．birds should migrate in the middle of the winter
B．longer days cause changes in the bodies of birds
C．seasonal changes in the length of days do not affect migration
D．increasing daylight increases the distance of migration
单项选择题
The airport's flow of international passengers for July is ______ the figure for the corresponding month of the previous year.
A．20% of
B．20% less than
C．80% more than
D．80% less than
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