单项选择题

A．Because Sam is a law school student.
B．Because Sam is her classmate.
C．Because Sam is her best friend.
D．Because Sam has some free time.
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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.
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.
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
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