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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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
According to one theory, when the glaciers disappeared, birds ______.
A．stopped migrating
B．continued migrating
C．stayed in the north
D．migrated south and stayed there
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