单项选择题


A．source
B．convention
C．origin
D．immigrant
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单项选择题
A．separateB．identicalC．independentD．different
A．separate
B．identical
C．independent
D．different
单项选择题
A．restrainedB．retainedC．reservedD．restricted
A．restrained
B．retained
C．reserved
D．restricted
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