单项选择题

The main topic of the passage is ______.

A．composition of the atmosphere
B．pressure from the atmosphere
C．air pollution in the atmosphere
D．the relationship between the atmosphere and men
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单项选择题
The American Automobile Association Foundation for Traffic Safety plans to ______.
A．try out the Japanese method in certain areas
B．sign the chevrons across the country
C．replace straight horizontal bars with chevrons
D．repeat the Japanese road patterns
单项选择题
What does the author say about straight, horizontal bars painted across roads
A．They are falling out of use in the United States
B．They tend to be ignored by drivers in a short period of time.
C．They are applicable only on broad roads.
D．They cannot be applied successfully to traffic circles.
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