立即发警报。（） A: Soundthebellimmediately. B: Soundthealarmimmediately. C: Ringthealarmimmediately. D: Ringthebellimmediately.
立即发警报。（） A: Soundthebellimmediately. B: Soundthealarmimmediately. C: Ringthealarmimmediately. D: Ringthebellimmediately.
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