题目

 (08·全国Ⅱ) From the time each of my children started school,I packed their lunches.And in each lunch,I   21   a note.Often written on a napkin(餐巾)，it might be a thank-you for a   22   moment,a reminder of something we were happily expecting,or a bit of   23   for the coming test or sporting event. In early grade school they   24   their notes.But as children grow older they become self-conscious(有自我意识的)，and   25   he reached high school,my older son,Marc,informed me that he no longer   26   my daily notes.Telling him that he no longer n 一个轻质小球靠近用毛皮摩擦过的橡胶棒时，它们相互吸引，则小球（　　） 　    A．一定不带电         B． 一定带负电               C． 一定带正电               D． 可能不带电