单项选择题

This conversation is mainly about ______

A．United States-agreement
B．Unlimited growth in population
C．Pollution in the Great Lakes
D．The limited supply of phosphates
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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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