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A．The reproductive cycle of barnacles.B．A new source of protein.C．Types of sea animals.D．The adhesive quality of barnacles.
A．The reproductive cycle of barnacles.
B．A new source of protein.
C．Types of sea animals.
D．The adhesive quality of barnacles.
单项选择题
A．The election for senator.B．The election for treasurer.C．The election for secretary.D．The election for president.
A．The election for senator.
B．The election for treasurer.
C．The election for secretary.
D．The election for president.
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