单项选择题

How many children in the United States suffer from the disorder

A．More than 25%.
B．Less than 25%.
C．One out of five.
D．One fourt
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单项选择题
What does the speaker imply
A．Outdoor advertising is colorful.
B．Outdoor advertising is the largest.
C．Outdoor advertising is important.
D．Outdoor advertising is necessary.
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