单项选择题

According to the passage, the time American children usually spend on watching TV________.

A．is more than four hours a day
B．is less than four hours a day
C．doubled in the' last twenty years
D．is more than on any other activities
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单项选择题
The time children spend on TV viewing every day is suggested to be about ________.
A．six hours
B．eight hours
C．three hours
D．one hour
单项选择题
The author tries to tell us in the first two paragraphs that ________.
A．children will get fatter if they eat too much
B．children will get thinner if they eat less
C．children will get fatter if they spend less time watching TV
D．children will get fatter if they spend more time watching TV
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