单项选择题
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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.
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单项选择题
A.130.B.3,900.C.13,000.D.1,300.
A.130.
B.3,900.
C.13,000.
D.1,300.
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