单项选择题

A．Some sea creatures developed backbones.
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．Singing loudly.B．Listening to music.C．Studying.D．Talking on the phone.
A．Singing loudly.
B．Listening to music.
C．Studying.
D．Talking on the phone.
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