B. whether everyone has a daily cycle or not

C. why people have their energy cycle at different times

D. what will happen in the family if the couple fail to realize which cycle each

member has

提示:细节理解题。根据文章第一段最后一句"No one has discovered why this is so."可知作者并没有解释原因,也没有人知道原因。

答案:C

2. For what reason may husbands and wives quarrel with each other?

A. Either of t hem gets up late in the morning.

B. Husbands and wives have different cycles of energy.

C. Either of them wants to change the cycle of the other's.

D. They do not know which cycle they themselves have.

提示:推理判断题。根据文章第二段内容可知B项正确。

答案:B

3.According to the passage,　　　.

A.one works better at one's peak energy point

B. if you know your cycle you can change it to fit your life

C. whenever you feel hot, your energy cycle reaches the highest

D. your energy cycle must be in the morning if you can get up early

提示:推理判断题。根据文章第一段第三句的"...the time of d ay when you feel most energetic is when your cycle of body temperature is at its peak (顶峰)."可知在巅 峰的时候,一个人会工作得更好。

答案:A

4. Which of the following can save your energy in the morning?

A. Getting up late.

B. Jumping out of bed as quickly as possible.

C. Looking for clean clothes.

D. Sitting for a while before getting out of bed.

提示:细节理解题。根据最后一段第三句"Sit on the edge of bed before putting your feet on the floor."可推知答案为D项。

答案:D