题目

Not long ago, I faced an enjoyable yet formidable(难以对付的) challenge. I was returning to my old neighborhood in the South Bronx to speak the students of my old school, Morris High.  As we drove down streets where my friend Gene Norman and I used to race bicycles, I thought of the problems awaiting the kids living here, the drugs, the temptations, and the crime. What could I say to encourage them? As we passed the hamburger place that I used to haunt, I remembered my growing-up years here, the joys, the sorrows, and the choices. Even then kids faced choices. There were drugs in my neig小林和小松的电学实验：（1）小林看小松连接了一个如图的电路，对小松说：“好像电路中有不合理的地方．”请在原图上只改动一根导线，要求是两个电流表分别测L1、L2的电流．（2）小松在做实验时，连好电路后发现灯泡不亮，他想知道电池中是否有电，你能否想到1种判断方法？（3）小林的父亲是一家工厂的负责人，其产品仓库要求从后门进货，前门取货．现有红、绿两只灯泡装在木板上，另有一个电池组、两个开关，如下图，还有若干条导线．利用这些材料，请你为仑库值班员设计一个电路要求：红灯亮，表示取货人在前门按开关；绿灯亮，表示送货人在后门按开关．①画出电路图；②将右图正确地用实线连接起来．