[单项选择]In the world of management, employees are nonexempt or exempt, depending on whether they get paid for overtime or not. (21) a creative scientist, like a creative artist, does not see his or her time. The very idea of a creative scientist (22) out time sheets is ludicrous. Fascination in science cannot be turned on or off on (23) The creative mind continues to wander (24) the body eats, exercises, or sleeps. Interruptions in or out of the laboratory, the library, the office or the home study may (25) a promising effort. (26) the well-established practice of moonlighting. Do what you need to do to keep the wolf (27) from the door, the world (28) your thesis adviser, team leader, or laboratory director. Then use the rest of your time, perhaps at night or on the weekends, to do (29) you really want to do. All of us who had done science know how to (30) effectively. So many scientific books are prefaced by remarks such as A. And B. Then C. But D. Because