单项选择题

A．Thanksgiving.
B．Christmas.
C．Spring Festival,
D．New Year.
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单项选择题
What is not the reason that may cause the loss of heating
A．Rock music.
B．Air-raid siren.
C．Portable stereos.
D．A coffee-room conversation.
单项选择题
Based on the logarithmic scale discussed in the first paragraph, how many times can a shotgun blast be more powerful than rock music
A．10.
B．100.
C．1,000.
D．10,000.
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