世界上最早的纸币是出现在我国北宋四川地区的（　　）

    This is my family.My mother is a teacher.She is very friendly.My father is a basketball player.He is tall and strong.My uncle is a cook.My aunt is a nurse.I am a student.I have no job.

如图所示电路，干路电流为I，通过滑动变阻器R₁的电流为I₁，通过定值电阻R₂的电流为I₂。开关闭合S，滑动变阻器的滑片P向右移动时，下列判断正确的是（  ）