题目

图甲为某同学测定电池的电动势和内电阻的实验电路图。图中R0为阻值2Ω的定值保护电阻。⑴ 该同学将电路连接好后闭合电键发现：电压表读数不为零，但电流表读数为零，检查确定各接线柱正确且接触良好。于是该同学用多用表的电压档检查电路，测得，而读数与电压表读数相同。由此可以推知故障是         。⑵ 将图乙的实物连线电路补充完整(用黑色笔连线)，并将用多用表的电压档检查电路中c、d两端的电压也用笔画线代导线将线路连接起 The heroine of the story found herself ________ for this married man who had consistently been after her. A．to fall B．falling C．fell D．fallen