题目

Have you ever imagined what life will be like in 2060? An international group of forty scientists have made some surprising predictions. They said that in the next forty years, our lives would change beyond our wildest dreams.Firstly, humans can grow body parts themselves. Dr. Ellen Heber-Katz is one of the forty scientists. He says, “People will think it common that sick organs (器官) can be repaired. It’s just like the way we fix a car.” Damaged parts will be taken away. Scientists could use human cells (细胞) to grow new organs. New technologies like this will also help people to 小红同学在探究并联电路的电流关系时，连接的实验电路如图所示。 （1）请你说明在开关S闭合后观察到的现象_______________。 （2）请你改动图中一根导线的连接位置，闭合开关S后，使两灯都发光，且电流表都有正常示数。（在需要改动的导线上画“×”，并画出改动后的连线） ⑶小伟同学帮助小红同学在电路中又添加了一块电流表，他们利用再次改动后的电路进行实验，得到的实验结论是：在并联电路中，干路电流等于支路电流之和，且支路电流相等。你认为他们的实验是否还有值得改进之处？如果有，应该如何改进？______________________________。