题目

For many people today, reading is no longer relaxation. To keep up their work they must read letters, reports, trade publications, interoffice communications, not to mention newspapers and magazines: a never-ending flood of words. In  1    a job or advancing in one, the ability to read and comprehend  2   can mean the difference between success and failure. Yet the unfortunate fact is that most of us are 3   readers. Most of us develop poor reading  4   at an early age, and never get over them. The main deficiency  5     in the actual stuff of language itself-words. Taken indi我国宋代学者沈括在《梦溪笔谈》记载：“登州海中，时有云气，如宫室、台观、城堞、人物、车马、冠盖．历历可见…”．文中所描述的是海市蜃楼的奇观．海市蜃楼现象的产生是由于（　　）A．光的折射B．光的反射C．光的直线传播D．光的色散