单项选择题

A．4 years
B．5 years
C．8 years
D．at least 9 years
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单项选择题
A．4B．3C．7D．8
A．4
B．3
C．7
D．8
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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