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.
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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.
单项选择题
Scientists think that by the year 2000, _______.
A．people will generally improve their hearing
B．people will have worse hearing
C．people will wear contact lenses and hearing aids as well
D．people wearing hearing aids will outnumber those wearing contact lenses
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