Phong and his grandpa are talking about some differences between ______., A.children in the city and the countryside, B. the living standards in the past and now, C. life in the past and now, D. past and present entertainment, Phong’s grandpa mentions ______ differences., A. two, B. three, C. four, D. five, Phong’s grandpa sees most of the changes as ______., A. positive, B. negative, C. unnecessary, D. necessary.

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