单项选择题

According to the author, the most important step in developing an effective campaign is______.

A．to select the best possible media
B．to create a good environment
C．to collect some information
D．to define the objectives
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单项选择题
According to the author,______.
A．drivers should apply courtesy properly
B．strict traffic regulations are badly needed
C．road courtesy should be valued in any circumstance
D．drivers should encourage old ladies to cross the road
单项选择题
The word them (Line 5, Para. 3) refers to______.
A．gaps
B．road courtesies
C．other drivers on the road
D．chances for a driver to accelerate
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