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.
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单项选择题
Who _______was coming to see me in my office this afternoon
A．you said
B．did you say
C．did you say that
D．you did say
单项选择题
What brought about the decline in the demand for American farm products
A．The impact of the Great Depression.
B．The shrinking of overseas markets.
C．The destruction caused by the First World War.
D．The increased exports of European countries.
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