题目

    There are three kinds of solar ovens. The first is a box cooker. It is designed with a special wall that shines or reflects sunlight into the box. Heat gets trapped under a piece of glass or plastic covering the top of the cooker. A box oven is effective for slow cooking of large amounts of food.     The second kind of solar oven is a panel(嵌板式) cooker. It includes several flat walls, or panels, which directly reflect the sun’s light onto the food. The food is inside a separate container of plastic or glass that traps heat energy. People can build panel cookers quickly如图所示的某段电路中，A、B、C、D、E是四个接线柱．A接电源的负极，E接电源的正极．（1）用导线连接A、B，则电流通过灯______，它们是______联的；（2）用导线只连接C、D，则电流通过灯______，它们是______联的．