题目内容：
阅读材料，回答题：Energy Cycle
Do you find getting up in the morning so difficult that it's painful? This might be called lazi-ness, but Dr. Kleitman has anew explanation. He has proved that everyone has adaily energycycle.
During the hours when you labor through your work you may say that you're "hot". That'strue. The time of day when you feel most energeticis when your cycle of body temperature is at itspeak. For some people the peak comes during the morning. For others it comes in the afternoon orevening. No one has discovered why this is so, but it leads to such familiar monologues as : "Getup, John! You'll be late for work again!" The possiB．le explanation to the trouB．le is that John isat his temperature-and-energy peak in the evening. Much family quarrelling ends when husbandsand wives realize what these energy cycles mean, and which cycle each member of the family has.
You can't change your energy cycle, B．ut you can learn to make your life fit to it better. HaB．itcan help, Dr. Kleitman B．elieves. MayB．e you're sleepy in the evening but you must stay up lateanyway. Counteract your cycle to some extent by haB．itually staying up later than you want to. Ifyour energy is low in the morning but you have an important job to do early in the day, risebeforeyour usual hour. This won't change your cycle, but you'll get up steam and work better at yourlow point.
Get off to aslow start which saves your energy. Get up with aleisurely yawn and stretch. Siton the edge of the bed aminute before putting your feet on the floor. Avoid the trouble of search-ing for clean clothes by laying them out the night before. Whenever possible, do routine work inthe afternoon and save tasks requiring more energy or concentration for your sharper hours.
If aperson finds getting up early aproblem, most probably__________. A．he is alazy person
B．he refuses to follow his own cycle
C．he is not sure when his energy is low
D．he is at his peak in the afternoon or evening
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