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Jetlag
Most people who travel long distances complain of jetlag (喷气飞行时差反应). Jetlag makes business travelers less productive and more prone【51】 making mistakes. It is actually caused by【52】 of your 'body clock' -a small cluster of brain cells that controls the timing of biological【53】. The body clock is designed for a regular rhythm of daylight and darkness-ness, so that it is thrown out of balance when it【54】 daylight and darkness at the 'wrong' times in a new time zonE.The symptoms of jetlag often persist for days【55】 the internal body clock slowly adjusts to the new time zonE.
Now a new anti-jetlag system is【56】 that is based on proven tentative pioneering scientific research. Dr. Martin Moore Ede has【57】 a practical strategy to adjust the body clock much sooner to the new time zone【58】 controlled exposure to bright light. The time zone shift is easy to accomplish and eliminates most of the discomfort of jetlag. A successful time zone shift depends on knowing the exact times to either【59】 or avoid bright light. Exposure sure to light at the wrong time can actually make jetlag worsE.The proper schedule【60】 light exposure depends a great deal on【61】travel plans. Data on a specific flight itinerary (旅行路线) and the individual's sleep【62】are used to produce a Trip Guide with instructions on exactly when to be exposed to bright light. When the Trip Guide calls【63】bright light you should spend time outdoors if possiblE.If it is dark outside, or the weather is bad,【64】you are on an aero plane, you can use a special light device to provide the necessary light【65】for a range of activities such as reading, watching TV or working.
(51)
A.at
B.up
C.to
D.from

A.B.
(51)
A.at
B.up
C.to

【参考答案】

C
解析:prone to是固定搭配,表示“倾向于……的”。
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The study of philosophies should make our own ideas flexiblE.We are all of us apt to take certain general ideas for granted, and call them common sensE.We should learn that other people have held quite different ideas, and that our own have started as very original guesses of philosophers.A scientist is apt to think that all the problems of philosophy will ultimately be solved by sciencE.I think this is true for a great many of the questions on which philosophers still arguE.For example, Plato thought that when we saw something, one ray of light came to it from the sun, and another from our eyes and that seeing was something like feeling with a stick. We now know that the light comes from the sun, and is reflected into our eyes. We don' t know in much detail how the changes in our eyes give rise to sensation. But there is every reason to think that as we learn more about the physiology of the brain, we shall do so, and that the great philosophical problems about knowledge are going to be pretty fully cleared up.But if our descendants know the answers to these questions and others that perplex ns today, there will still be one field of which they do not know, namely the futurE.However exact our science, we cannot know it ns we know the past. Philosophy may be described as argument about things of which we are ignorant. And where science gives us a hope of knowledge it is often reasonable to suspend judgment. That is one reason why Marx and Engels quite rightly wrote to many philosophical problems that interested their contemporaries.But we have got to prepare for the future, and we cannot do so rationally without some philosophy. Some people say we have only got to do the duties revealed in the past and laid down by religion, and god will look after the futurE.Other say that the world is a machine and the course of future events is certain, whatever efforts we may makE.Marxists say that the future depends on ourselves, even though we are part of the historical process. This philosophical view certainly does inspire people to very great achievements. Whether it is true or not, it is powerful guide to action.We need a philosophy, then, to help us to tackle the futurE.Agnosticism easily becomes an excuse for laziness and conservatism. Whether we adopt Marxism or any other philosophy, we cannot understand it with-out knowing something of how it developeD.That is why knowledge of the history of philosophy is important to Marxists, even during the present critical days.What is the main idea of this passage?A.The argument whether philosophy will ultimately be solved by science or not.B.The importance of learning philosophies, especially the history of philosophy.C.The difference between philosophy and sciencE.D.A discussion about how to set a proper attitude towards futurE.
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