C)By using memory and fluency tests.-|||-B)By tracking people`s living habits. D)By scanning people`s brains.-|||-23.A)Watching television for hours. C)Reading books and magazines.-|||-B)Playing video games. D)Surfing the Internet.-|||-24.A)Television viewing may be a potential factor for Alzheimer`s disease.-|||-B)Alzheimer`s patients tend to watch television more than 3 hours a day.-|||-C)Some research has confirmed the link between them.-|||-D)Television watching is beneficial to Alzheimer`s patients.-|||-25.A)Watch television no more than 3 hours each day.-|||-B)Balance television viewing with other contrasting activities.-|||-C)Watch some educational TV programs.-|||-D)Take more physical exercise.

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