单项选择题

A．Mating habits of squid and octopus.
B．The evolution of certain form of sea life.
C．The study of marine shells.
D．Survival skills of sea creatures.
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单项选择题
A．Replacing the native corn with the hybrid corn.B．Replacing the hybrid corn with the native corn.C．Replacing the new type of corn with the traditional corn.D．Replacing the traditional corn with the native corn.
A．Replacing the native corn with the hybrid corn.
B．Replacing the hybrid corn with the native corn.
C．Replacing the new type of corn with the traditional corn.
D．Replacing the traditional corn with the native corn.
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