单项选择题

A．Migrating birds follow a certain smell or scent.
B．Animals migrate by following changes in temperature.
C．Animals find their way by recognizing geographical features.
D．Migrating mammals use the rising and falling of tidal waves.
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单项选择题
A．medical school studentsB．businesses and manufacturesC．political campaign participantsD．actors, technicians and others
A．medical school students
B．businesses and manufactures
C．political campaign participants
D．actors, technicians and others
单项选择题
A．After geometry class.B．After a cooking lesson.C．After the cooking class.D．Uncertain.
A．After geometry class.
B．After a cooking lesson.
C．After the cooking class.
D．Uncertain.
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