单项选择题

A．More buffalo are surviving the winter.
B．Fewer buffalo are dying of disease.
C．More buffalo are being born.
D．Fewer buffalo are being killed by hunters.
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单项选择题
A．A vacation trip to Yellow Stone Park.B．A lecture by a visiting professor.C．Her biology thesis.D．A research project.
A．A vacation trip to Yellow Stone Park.
B．A lecture by a visiting professor.
C．Her biology thesis.
D．A research project.
单项选择题
A．Mating habits of squid and octopus.B．The evolution of certain forms of sea life.C．The study of marine shells.D．Survival skills of sea creatures.
A．Mating habits of squid and octopus.
B．The evolution of certain forms of sea life.
C．The study of marine shells.
D．Survival skills of sea creatures.
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