题目

阅读理解 In my bag I always carry the same essential items: my keys, my purse, some loose change, my mobile phone and my little blue vocabulary notebook. This year I am living abroad in Germany and I am trying to learn as much German as possible. I always knew that living abroad would be a great way to learn a foreign language but one thing I didn't realize was how many new words and phrases I would come across every day! I see and hear new words everywhere; the announcements in the train station; menus in cafes; on social media; on the local newspaper and of course from my German-speaking关于点电荷的说法，正确的是（ ）A．只有体积很小的电荷，才能作为点电荷B．体积很大的电荷，一定不能作为点电荷C．点电荷一定是带电量很小的电荷D．两个带电的金属小球，不一定能将它们作为电荷集中在球心的点电荷处理