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O (acquaintances)
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A．Animals lived in cages made of concrete with iron bars.B．Animals lived in natural environments.C．Streams of water flew through the cages.D．Several species of animals lived together.
A．Animals lived in cages made of concrete with iron bars.
B．Animals lived in natural environments.
C．Streams of water flew through the cages.
D．Several species of animals lived together.
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prohibition
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