单项选择题

A．Some sea creatures developed vertebrae.
B．The first giant squid was captured.
C．Some sea creatures shed their shells.
D．Sea life became more intelligent.
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单项选择题
A．Ten decades.B．A quarter of century.C．One decade.D．One-tenth of year.
A．Ten decades.
B．A quarter of century.
C．One decade.
D．One-tenth of year.
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