Do you find getting up in the morning so difficult that it's painful？This might be called laziness, but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy cycle.

During the hours when you labour through your work you may say that you're "hot". That's true. The time of day when you feel most energetic is when your cycle of body temperature is at its peak. For some people the peak comes during the morning. For others it comes in the afternoon or evening. No one has discovered why this is so, but it leads to such familiar monologues as: "Get up, John！You'll be late for work again！The possible explanation to the trouble is that John is at his temperature-and-energy peak in the evening. Much family quarrelling ends when husbands and wives realize what these energy cycles mean, and which cycle each member of the family has.

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.

Get off to a slow start which saves your energy. Get up with a leisurely yawn and stretch. Sit on the edge of the bed a minute before putting your feet on the floor. Avoid the trouble of searching for clean clothes by laying them out the night before. When ever possible, do routine work in the afternoon and save tasks requiring more energy or concentration for your sharp hours.

1．If a person finds getting up early a problem, most probably _______.

A．he is a lazy person 

B．he refuses to follow his own energy cycle 

C．he is not sure when his energy is low 

D．he is at his peak in the afternoon or evening 

2．Which of the following may lead to family quarrels according to the passage？ 

A．Unawareness of energy cycles. 

B．Familiar monologues. 

C．A change in a family member’s energy cycle. 

D．Attempts to control the energy cycle of other family members. 

3．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 

4．You are advised to rise with a yawn and stretch because it will _______. 

A．help to keep your energy for the day’s work 

B．help you to control your temper early in the day 

C．enable you to concentrate on your routine work 

D．keep your energy cycle under control all day 

5．Which of the following statements is NOT TRUE？ 

A．Getting off to work with a minimum effort helps save one’s energy. 

B．Dr．Kleitman explains why people reach their peak at different hours of day. 

C．Habit helps a person adapt to his own energy cycle. 

D．Children have energy cycles, too.
1．根据文章第1段可以看出早晨起不来是同一个人每天的能量周期有关。根据文章第2段中John的自言自语，以及紧接着的解释：John is at his temperature-and-energy peak in the evening 推理，如果一个人早上不能早起，这个人的能量高峰就很可能在下午或晚上。因此选项D是正确答案。 

2．第2段的最后一句是“如果丈夫和妻子能明白能量周期是怎么回事，了解家庭每个成员有什么样的周期，很多家庭争吵就会停止。选项A. Unawareness of energy cycles（不知道能量周期）应是正确答案。 

3．根据文章第3段中的最后两句的信息可以作出正确判断，选项C是正确答案。 

4．看懂文章最后一段的第1句：Get off to a slow start which saves your energy. （早上慢慢起床可以节省能量。）紧接该句的3个句子都是慢慢起床的具体做法。因此选项A是正确答案。 

5．第2段中No one has discovered why this is so ...的意思是“没有人发现为什么会有不同的能量周期?”既然没有人清楚这一点，Kleitman博士也不可能解释为什么人们会在一天的不同时刻达到能量高峰。因此B项是正确答案。