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A．medical school students
B．businesses and manufactures
C．political campaign participants
D．actors, technicians and others
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单项选择题
A．Salmon and tunas.B．Locusts and butterflies.C．Ants and bees.D．Whales and bats.
A．Salmon and tunas.
B．Locusts and butterflies.
C．Ants and bees.
D．Whales and bats.
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