单项选择题

A．Only one.
B．Two.
C．Three.
D．More than three.
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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．Natalie already knows about the surprise party.B．Eugene and Natalie are not good friends.C．Eugene will probably tell Natalie about the party.D．Eugene won’’t tell Natalie about the party.
A．Natalie already knows about the surprise party.
B．Eugene and Natalie are not good friends.
C．Eugene will probably tell Natalie about the party.
D．Eugene won’’t tell Natalie about the party.
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