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