单项选择题

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.
单项选择题
A．Holiday celebrations in the United States often ignore the importance of family.B．Holiday celebrations in the United States often are centered around the family.C．Holiday celebrations in the United States often are centered around work.D．Holiday celebrations in the United States often are centered around animals.
A．Holiday celebrations in the United States often ignore the importance of family.
B．Holiday celebrations in the United States often are centered around the family.
C．Holiday celebrations in the United States often are centered around work.
D．Holiday celebrations in the United States often are centered around animals.
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