单项选择题

According to the woman, what causes most of the damage to the air

A．Industrial sources.
B．Automobiles.
C．Nitrogen sources.
D．Natural activities.
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单项选择题
What is the main topic of the conversation
A．The development of the automobile.
B．Declining air quality.
C．The structure of nitrous oxides.
D．Air quality management.
单项选择题
From the way she speaks to the man, the woman seems______
A．to be in a hurry to leave
B．to be curious about him
C．to be happy to assist him
D．to be unfamiliar with the town
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