单项选择题

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.
单项选择题
A．A cook.B．A teacherC．A clerkD．A student
A．A cook.
B．A teacher
C．A clerk
D．A student
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