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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 【21】 making mistakes. It is actually caused by 【22】 of your “body clock” a small cluster of brain cells that controls the timing of biological 【23】 The body clock is designed for a 【24】 rhythm of daylight and darkness, so that is thrown out of balance when it 【25】 daylight and darkness at the “wrong times in a new time zonE.The 【26】 of jetlag often persist for days 【27】 the internal body clock slowly adjusts to the new time zonE.Now a new antijetlag system is 【28】 that is based on proven 【29】 pioneering scientific research. Dr. martin Moore-Ede has 【30】 a practical strategy to adjust the body clock much sooner to the new time zone 【31】 controlled exposure to bright light. The time zone shift is easy to accomplish and eliminates 【32】 of the discomfort of jetlag.
A successful time zone shift depends on knowing the exact times to either 【33】 or avoid brightlight. Exposure to light at the wrong time can actually make jetlag worsE.The proper schedule 【34】 light exposure depends a great deal on 【35】 travel plans.
Data on a specific flight itinerary(施行路线) and the individual's sleep 【36】 are used to produce a Trip Guide with 【37】 on exactly when to be exposed to bright light.
When the Trip Guide calls 【38】 bright light you should spend time outdoors if possiblE.If it is dark outside, or the weather is bad, 【39】 you are on an aeroplane, you can use a special light device to provide the necessary light 【40】 for a range of activities such as reading, watching TV or working.
【21】
A.for
B.from
C.to
D.of

A.B.
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【21】
A.for
B.from
C.to

【参考答案】

C
解析：本题测试形容词与介词的搭配关系。prone是形容词，要与介词 to 搭配，因此C是答案。prone t......

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Will people ever tame the destructive, often deadly hurricane? Either scientists or meteorologists do not yet understand the forces that generate a hurricane, but perhaps with study and time they can learn to control these enormous storms. One important study project is called Hurricane StrikE.This project studies the huge Storms that do harm to thousands of people and destroy property worth millions of dollars. Scientists in this project are trying to learn more about hurricanes, especially the speed and direction of the winds. Then people living in the path of a hurricane can protect themselves and their belongings.Dr. Robert Sheets, the chief forecaster at the National Hurricane Center in Miami, explained the importance of this information. 'When we post a hurricane warning for a part of the coast,' he said, 'people spend about $8,000 per mile in preparation. If the hurricane does not strike land where we announced or posted warnings, then that money is wasteD.But, even worse, the next time we put out a warning, the people might not pay attention to us.' That is the reason for Project Hurricane Strike—to increase the accuracy of the forecast. They need to predict where the storm will be twenty-four hours later.One hurricane, named Belle, made forecasters feel troublE.At first it appeared to be headed for Florida, so warnings were posteD.However, the storm stayed at seA.Next, warnings were posted in Georgia and the Carolinas, but again it did not hit. In fact, Belle first hit the coast in New York. Millions and millions of dollars were spent on the preparation that was not needeD.Dr. Sheets said, 'We received hundreds of letters. People couldn't understand how science could send people to the moon but not predict a storm's path. However, we still can't tell. The only way to find out about hurricanes is from inside them.' Prediction is what Project Hurricane Strike is about, and that is part of the challenge that faces meteorologists.The other part of the challenge is controlling hurricanes. Meteorologists work inside a hurricane by 'seeding' the center 'eye' with silver iodidE.The silver iodide causes raindrops to form. and fall over the ocean. Taking the water out of the clouds reduces the energy of the storm. So, the rotation of the storm decreases. The wind velocity also decreases. Meteorologists can sometimes use this method to bring a dangerous hurricane under control.Scientists have already seeded some hurricanes that were forming over the Atlantic Ocean. Some of these experiments were successful in decreasing wind speeds.The two factors concerning hurricanes that scientists most want to learn about are ______.A.conditions in the 'eye' and conditions at the edgeB.the forces that generate them and theft frequencyC.the number of people injured and the amount of damage doneD.how fast and where they move

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What difference does it make if we read texts displayed on a computer screen instead of on paper printed with ink? The computer certainly does not secure deeper comprehension, greater subtlety of mind, or a wider range of imaginative referencE.The mediation of a computer, however, put new powers at the disposal of intelligencE.The computer itself can do simple reading—as I have noted, it can 'read' an immense body of literature in search of designated words. As anyone knows who has ever spent days in libraries in search of errant information, simply identifying relevant sources absorbs inordinate amounts of time in research. The objection may be raised that a search of texts by computer may block the discoveries that occur while browsing in the stacks of great libraries. No member of the academy need fear that the use of a computer will keep him from the stacks, but browsing is easier if texts can be called up on a screen in the serenity of one's chosen surroundings. The great deficiency of libraries, as we know, is that while titles are catalogued, the libraries have no master indexes of the contents of books. Individual volumes, it is true, have indexes, often of inferior quality, but even the best indexes must be examined ones at a timE.The great ad vantage of the electronic library is that a computer could search and analyze its contents without proceeding volume by volumE.As work in artificial intelligence develops, computer systems may also become adept at more complex tasks, such as summarizing texts, which has been finished experimentally.What does the writer mainly talk about in this passage?A.The deficiencies of the library in providing information.B.The different applications of the computer and the library.C.The advantages and disadvantages of the computer and library.D.The advantages of the computer in search of information.

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