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The tone of the passage is ______.

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

单项选择题A century ago, how many lived to, or past 100, within a population of 5 million

A．5,000,000.
B．10,000.
C．50,000.
D．1,000.