单项选择题

A．Three.
B．Four.
C．Five.
D．Six.
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单项选择题
A．Enforcing laws contrelling navigation, shipping, immigration and fishing.B．Enforcing laws affecting the privately - owned bests in the U. S.C．Searching for missing beats and rescuing people.D．Training people to good swimmers along the beach.
A．Enforcing laws contrelling navigation, shipping, immigration and fishing.
B．Enforcing laws affecting the privately - owned bests in the U. S.
C．Searching for missing beats and rescuing people.
D．Training people to good swimmers along the beach.
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.
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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