单项选择题

The conference was organized for all the ______ in the city ( )

A．mathematics teacher
B．mathematic teachers
C．mathematics teachers
D．mathematic's teachers
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单项选择题
30（）

A．houses
B．dogs
C．pets
D．families
单项选择题
According to one theory, when the glaciers disappeared, birds（）

A．stopped migrating
B．continued migrating
C．began migrating again
D．migrated south and stay there
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