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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1.单项选择题The only trouble with young drivers is that ______.
A．they are proud of their cars
B．they tend to own sports cars
C．they soon become like the older ones
D．they think they are on the battlefield
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