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　　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

　　【正确答案】 C

　　【答案解析】本题要求读者找出本段中的最后两句，并联系本段开头两句的意思，作出正确判断。本段开头说，“虽然你无法改变自己的能量周期，但你可以使你的生活适合这一周期。Dr. Kleitman认为经常性的行为(对你的能量周期)能起作用。”最后两句又说，“…rise before your usual hour…work better at your low point．”(“如果你在上午处于能量的低潮，但你有重要的工作要在上午做，那么你就要比平时早起。这并不改变你的周期，但你可以在低潮时得到能量，工作得更好。”)因此选项C是正确答案。