题目

I’ve been in the taxicab business for thirty-five years, and I know there is a lot about it that is not so good. Taxicab drivers have to be tough fellows to be able to work in New York. You’ve got to fight the New York traffic eight hours a day these days, so people get the wrong impression that they are bad. Actually, taxi drivers are just like other people. Most of them will behave as honest fellows. You read in the papers almost every week that a taxi driver turns in money or jewels that people leave in their cabs. If they weren’t honest, you wouldn’t be reading those stori3．如图所示的四个电路图中，各开关都闭合后灯泡L2被短路的是（　　）A．B．C．D．