单项选择题

The topic of the passage is ______.

A．the harmful influence of television in the home environment
B．the role of television in the socialization of children
C．the American children's television-viewing pattern
D．the role of mass media in developing children's basic skills

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单项选择题

In the view of the author, the studies of the impact of television violence on children______.

A．have produced convincing results
B．have yet to be conducted
C．haven't touched upon long-term effects
D．haven't arrived at any meaningful conclusion

单项选择题

The tone of the passage is ______.

A．pleading
B．hopeful
C．pessimistic
D．jocular