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．It helps manufacturers sell their products to millions of people.B．It brings the theater and other cultural events into the home.C．It can change the way people think, speak and dress.D．It allows medical students to get close-up views of operations.
A．It helps manufacturers sell their products to millions of people.
B．It brings the theater and other cultural events into the home.
C．It can change the way people think, speak and dress.
D．It allows medical students to get close-up views of operations.
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