2.C 【句意】你不应该在书的空白处写字，因为这本书是图书馆的。 【解析】名词词义辨析。interval“间隔”，at intervals“每隔一段时间；间或”；border“国界；边界”；margin“页边的空白；边缘”；edge“边沿；刀刃；锐利”。由句中关键词“since the book belongs to the library因为这本书是图书馆的”的对应可知“页边的空白”符合语境，故C项正确。
【汉译英参考答案】 1. I feel keenly that my ability falls short of my wishes. 2. She saw what had happened and went through the roof.
