单项选择题
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A.The teacher postponed the conference.
B.There won’’t be a test this afternoon.
C.The students will be attending the conference
D.The students took a science test that afternoon.
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单项选择题
A.Diligent.B.Interesting.C.Creative.D.Cooperative.
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
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