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    　　PALOALTO, California--Turning off the television may help prevent children from getting fatter, even if they do not change their diet or increase the amount of their exercise.”US researchers said last week.

    　　A study of 192 third and fourth graders, generally aged eight and nine, found that children who cut the number of hours spent watching television gained nearly two pounds, or 0.91 kilogram less over a one-year period than those who did not change their television diet.

    　　“The findings are important because they show that weight loss can only be the result of the reducing of watching TV and not any other activity,”said Thomas Robinson, a pediatrician (儿科专家)at Stanford University.

    　　“American children spend an average of more than four hours per day watching television and videos and playing video games, and rates of childhood being fat have doubled over the past 20 years,”Robinson said.

    　　In the study, presented this week to the Pediatric Academic Societies annual meeting in San Francisco, the researchers persuaded about 100 of the students to reduce their television viewing by one-quarter to one-third.

    　　Children watching fewer hours of television showed a smaller increase in waist size and had less body fat than other students who continued their normal television viewing, even though neither group ate a special diet nor took part in any extra exercise.

    　　“One explanation for the weight loss could be the children unattracted to the television may simply have been moving around more and burning off calories.”said Robinson.

    　　“Another reason might be due to eating fewer meals than in front of the television. Some studies have suggested that eating in front of the TV encourages people to eat more,”Robinson said.

    1．In the first two paragraphs the writer tells us that ________.

    [　　]

    A．children will get fatter if they spend more time watching TV

    B．children will get fatter if they spend less time watching TV

    C．children will get fatter if they eat too much

    D．children will get thinner only if they take extra exercises

    2．According to the passage, the time American children usually spend watching TV ________.

    [　　]

    A．is more than four hours a day

    B．is more than on any other activities

    C．is less than four hours a day

    D．doubled in the last twenty years

    3．It is suggested that the time children spend watching every day should be about ________.

    [　　]

    A．six hours
    B．three hours
    C．one-quarter of a day
    D．one hour

    4．Why can watching TV increase kids' weight according to the passage?

    [　　]

    A．They usually burn off fewer calories though they eat less.

    B．They usually eat more when they are watching television.

    C．They change their diet while watching TV.

    D．They have been moving around.

    答案：A;A;B;B
    解析：

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