单项选择题
A．signs
B．gestures
C．signals
D．marks
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单项选择题
A．boundlessB．changeableC．limitlessD．ceaseless
A．boundless
B．changeable
C．limitless
D．ceaseless
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单项选择题
A．matingB．excitingC．warningD．boring
A．mating
B．exciting
C．warning
D．boring
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