2. 外语
  3. International airlines have rediscovered the business travelers, the man or woman who regularly jets from country to country as

International airlines have rediscovered the business travelers, the man or woman who regularly jets from country to country as

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问题      International airlines have rediscovered the business travelers, the man or woman who regularly jets from country to country as part of the job. This does not 【C1】______  mean that airlines ever 【C2】______  their business travelers. Indeed, companies like Lufthansa and Swissair would rightly argue that they have always 【C3】______  best for the executive class passengers. But many lines could be 【C4】______  of concentrating too heavily in the recent past 【C5】______  attracting passengers by volume, often at the 【C6】______  of regular travelers. Too often, they have seemed geared for quantity 【C7】______  than quality. Operating a major airline in the 1980s is essentially a 【C8】______  of finding the right mix of passengers. The airlines need to fill 【C9】______  the back end of their wide-bodied jets with low fare passengers, without forgetting that the front end should be filled with people who pay 【C10】______  more for their tickets.
     It is no 【C11】______  that the two major airline bankruptcies in 1982 were among the companies 【C12】______  in cheap flights. But low fares require consistently full aircraft to make flights 【C13】______  viable (可行的), and in the recent recession the volume of traffic has not grown. Equally the large number of airlines jostling (争夺) for the 【C14】______  passengers has created a huge excess of capacity. The net result of excess capacity and cut-throat 【C15】______  driving down fares has been to push some airlines into 【C16】______  and leave many others hovering on the 【C17】______  
     Against this grim background, 【C18】______  is no surprise that airlines are turning increasingly 【C19】______  the business travelers to improve their rates of return. They have 【C20】______  much time and effort to establish exactly what the executive demands for sitting apart from the tourists.   
【C5】
选项 A、to
B、for
C、in
D、on
答案D
解析 此处前面的in the recent past是时间状语，too heavily修饰concentrating，因此需填人的介词应与concen-trate构成搭配，故答案为on。concentrate on意为“集中，全神贯注于”。  
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