题目

根据短文内容, 完成下列各题。 Jack's friend Sally isn't fine these days. One day she asks Jack for help. And she tells (告诉) Jack about her eating habits. For breakfast, she always eats some bread. For lunch, she always has some chicken. She likes eating ice-cream and a hamburger in the evening. “They're not healthy for you, Sally,” Jack says. “I know, but I like them,” Sally says. “What about vegetables? Do you like eating carrots?” Jack asks. “No, I don't,” Sally says. “Sally, don't eat ice-cream. You must eat some vegetables and fruit. Th当电路发生短路时，电路中的______很大，这是因为________________。