19．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（節(jié)奏、韻律） 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．（71）F 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．
（71）E 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 25hours．
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 10p．m．high of 37.2℃to a pre-dawn low of 36.1℃，mental functions fall too．（73）D
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．（74）G 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．（75）B 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．
分析 本文屬于說明文閱讀，作者通過這篇文章主要向我們描述了如何讓時間變得高效的一些方法．
解答 71．F 推理判斷題．根據(jù)上文提到But it's not just the experts who are switching on to the way our bodies work但這不僅僅專家打開我們身體工作的方式，許多人在制定日常計劃之前研究他們的身體規(guī)律．故選F
72．E 推理判斷題．根據(jù)下文提到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睡眠，血壓，激素水平和心跳都有自己的生物鐘，這與人為的24小時的規(guī)律有一點點關系，專家說身體的每個方面都會影響日常的規(guī)律．故選E
73．D 推理判斷題．根據(jù)上文提到As it falls from a 10 p．m．high of 37.2℃to a pre-dawn low of 36.1℃，mental functions fall too當溫度從上午10點37.2℃到黎明前的36.1℃，身體的功能也在下降，這就是輪班所導致的許多問題的原因．故選D
74．G 推理判斷題．根據(jù)上文提到The three operators in the control room worked alternating（交替的） weeks of day，evening and night shifts在控制室的三個實驗人員交替的工作，白天，晚上和夜晚，這種危險的聯(lián)系不會讓身體有機會平靜下來．故選G
75．B 推理判斷題．根據(jù)上文提到For example，the time we eat may be important if we want to maximize intellectual or sporting performance比如如果我們想擴大我們的知道或運動表現(xiàn)，我們所花費的時間就是很重要的，目標是幫我們變得更高效．故選B
點評 七選五閱讀是完成性閱讀，和完形填空很類似，不同的是一個選詞，一個選句子．解題時，要注意上下文語境，充分考慮信息詞（選項中和空格前后句子中相同或相近的詞），選出最符合語境的句子．
