如图是大型电子地磅秤的电路图（电源电压恒定），AB间的弹簧中间有可收缩的导线将滑动变阻器接入电路，R₁为定值电阻．当闭合开关S，A板上受到的压力F增大时，电流表和电压表的示数将会发生改变．为使压力增大时，压力计的示数随指针向右摆动而增大，应把____ （填“电流表”或“电压表”）改装为压力计．

②如图乙所示，如果在乙烧杯上倒扣一只稍大一些的烧杯，我认为会发生的现象是：____；解释原因：____．

     Mr. Green lives in a big city with his wife and two children. One morning Mr. Green takes his new car and washes it when a friend comes. The friend stops and looks at the new car for a minute. Then he asks, "That's a new car. Is it yours? "
"Sometimes." Mr. Green answers.
   The friend is surprised (惊奇). "Sometimes? " he says. "What do you mean?" Mr. Green answers slowly, "Well, when there is a party in town, my daughter Jean drives it. When there is a football, it's my son Jim's turn. When I washes it and it looks very nice and clean, my wife Linda uses it. And when it needs cleaning. It's mine. Choose the correct answer.