某同学将完好的仪器连接成如图所示的电路(其中滑动变阻器的连线没有画出)，用来探究通过电阻的电流跟两端电压的关系。

    Yesterday，Amy and Mary went to the zoo by bike. They saw pandas, lions, monkeys and elephants. They were very happy. They were thirsty, so they bought a watermelon. Amy carried the watermelon on her bike. But it fell off her bike and bumped her foot(脚).