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．＄ 500.B．＄ 550.C．＄ 450.D．＄ 50.
A．＄ 500.
B．＄ 550.
C．＄ 450.
D．＄ 50.
单项选择题
A．The person who designed the library building.B．The author of several books in the library.C．The first director of the library.D．The biology professor after whom the library is named.
A．The person who designed the library building.
B．The author of several books in the library.
C．The first director of the library.
D．The biology professor after whom the library is named.
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