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　　補全短文

　　You can't change your energy cycle, but you can learn to make your life fit it better. Habit can help,Dr.Kleitman believes. Maybe you're sleepy in the evening but you must stay up late anyway.Counteract your cycle to some extent by habitually staying up later than you want to.If your energy is low in the morning but you have an important job to do early in the day, rise before your usual hour.This won't change your cycle, but you'll get up steam and work better at your low point.
　　If one wants to work more efficiently at his low point in the morning,he should _______.

　　A、change his energy cycle

　　B、overcome his laziness

　　C、get up earlier than usual

　　D、go to bed earlier

　　【正確答案】 C

　　【答案解析】本題要求讀者找出本段中的最后兩句，并聯(lián)系本段開頭兩句的意思，作出正確判斷。本段開頭說，“雖然你無法改變自己的能量周期，但你可以使你的生活適合這一周期。Dr. Kleitman認(rèn)為經(jīng)常性的行為(對你的能量周期)能起作用。”最后兩句又說，“…rise before your usual hour…work better at your low point．”(“如果你在上午處于能量的低潮，但你有重要的工作要在上午做，那么你就要比平時早起。這并不改變你的周期，但你可以在低潮時得到能量，工作得更好。”)因此選項C是正確答案。