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
According to the government source, the unrest was sparked by________.
A．Islamic extremists protesting against poverty
B．the trial of 23 Muslim businessmen
C．the rebellion against Karimov’’s hard line against Muslims
D．the opposition party protesting against corruption
单项选择题
________were reported by the weather station in Chicago.
A．Sunny skies
B．Cloudiness, but no rain
C．light showers
D．Thunderstorms
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