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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单选题 | According to the passage, the preservation of rain forests ________. | 查看答案 |
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单选题 | Do you have any ________ about what living beings on other planets would be like? | 查看答案 |
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