单项选择题

A．Diligent.
B．Interesting.
C．Creative.
D．Cooperative.
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单项选择题
Commercials create the sensation of loudness because______.
A．TV stations always operate at the highest sound levels
B．their sound levels are kept around peak levels
C．their sound levels are kept in the middle frequency ranges
D．unlike regular programs their intensity of sound varies over a wide range
单项选择题
A．They will face extinction without artificial reproduction.B．They will have to migrate to find new homes.C．They will be able to survive in the preserves.D．They will gradually die out.
A．They will face extinction without artificial reproduction.
B．They will have to migrate to find new homes.
C．They will be able to survive in the preserves.
D．They will gradually die out.
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