单项选择题

A．They use many different methods.
B．All birds follow major geographical features.
C．All birds use their memory of a map.
D．We have no information about this.
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单项选择题
A．Food packaging.B．Varieties of fish.C．A new snack food.D．An artificial food flavorin
A．Food packaging.
B．Varieties of fish.
C．A new snack food.
D．An artificial food flavorin
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