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A．The effects of noise on the quality of life.
B．The role of air traffic restrictions.
C．The production of quieter engines.
D．Tile economic aspects of noise reduction.
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单项选择题
A．They are quite difterent in painting skills.B．Neither of them is good at house-painting.C．They are equally good at house-painting.D．Both of them will paint the house the day after tomorrow.
A．They are quite difterent in painting skills.
B．Neither of them is good at house-painting.
C．They are equally good at house-painting.
D．Both of them will paint the house the day after tomorrow.
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