题目

During my third year of university, I spent six months studying in Rio de Janeiro, Brazil. Many are worried about travelling to Rio but I promise, it is worth a visit. Now I want to share my top recommendations (推荐) for experiencing Rio less as a tourist but more like a native Brazilian.Pedra BonitaRio is full of hiking routes, and some Brazilians love to spend an afternoon hiking. My favorite route of all has to be Pedra Bonita. Pedra Bonita involves a steep climb of about an hour through tall trees, and I admit it is difficult in Rio’s heat, but you are rewarded at the top with a wonde 如图所示电路，如果开关S闭合将发生的现象是 [　　] A．L1发光 B．L2发光 C．L1、L2都发光 D．L1、L2都不发光，电源因短路可能被烧坏