单项选择题

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A．The effects of noise on the quality of life.
B．The role of air traffic restrictions.
C．The production of quieter engines.
D．The economic aspects of noise reduction.
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单项选择题
What does advertising do with the products we already know about
A．To introduce their new functions.
B．To compare them with new products of the same sort.
C．To tell that they are still available.
D．To correct any impropriate information about them.
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