Question

根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Rhythm of Life

Choosing the right time to sleep, the correct moment to make decisions, the best hour to eat—and even go into hospital—could be your key to perfect health.

Centuries after man discovered the rhythms(节奏、韵律) of the planets and the cycles of crops, scientists have learned that we too live by precise rhythms that govern everything from our basic bodily functions to mental skills. Man is a prisoner of time.

But it’s not just the experts who are switching on to the way our bodies work. 1. Prince Charles consults a chart which tells him when he will be at his peak on a physical, emotional and intellectual level. Boxer Frank Bruno is another who charts his bio-rhythms to plan for big fights.

2. Sleep, blood pressure, hormone levels and heartbeat all follow their own clocks, which may bear only slight relation to our man-made 24-hour cycle.

Research shows that in laboratory experiments when social signals and, most importantly, light indicators such as dawn are taken away, people lose touch with the 24-hour clock and sleeping patterns change. Temperature and heartbeat cycles lengthen and settle into “days” lasting about 25 hours.

In the real world, light and dark keep adjusting internal clock to the 24-hour day. But the best indicator of performance is body temperature. As it falls from a 10 p.m. high of 37.2℃ to a pre-dawn low of 36.1℃, mental functions fall too. 3.

The most famous example is the nuclear accident at Three Mile Island in the US. The three operators in the control room worked alternating(交替的) weeks of day, evening and night shifts. 4. Investigators believe this caused the workers to overlook a warning light and fail to close an open valve.

Finding the secret of what makes us tick has long fascinated scientists and work done over the last decade has yielded important clues. 5. For example, the time we eat may be important if we want to maximize intellectual or sporting performance. There is already evidence suggesting that the time when medicine is given to patients affects how well it works.

A. The rhythm of life is a slight beat.

B. The aim is to help us become more efficient(高效的).

C. Jenny Hope claims to have tested their body clocks to the limit.

D. This is a key reason why shift work can cause so many problems.

E. Experts say every aspect of human bodies is influenced by daily rhythms.

F. Many people study the state of their bio-rhythms before making their daily plans.

G. Such a dangerous combination never gave their bodies’ natural rhythms a chance to settle down.

Answer 1