单选题 One reason that might explain Page's sleeplessness was _________.

A、 his mother's injury before he was born
B、 that he had gradually got rid of the sleeping habit
C、 his magnificent physical condition
D、 that he hadn't got a bed

【正确答案】 A

【答案解析】[解析] 从文章最后一段“They found only one answer that might explain this condition．Page remembered some talk about his mother having been injured several days before he was born”可知本题答案为A。