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 abandoned their business travelers.【C2】______, companies like Lufthansa and Swissair would rightly argue that they have always【C3】______best for the executive-class passengers.【C4】______many lines could be accused 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(n)【C8】______of finding the right mix of passengers. The airlines need to fill up the back end of their wide-bodied jets with passengers paying a【C9】______fare, 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 economically viable (可行的), and in the recent recession the【C13】______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 cutthroat【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【C19】______increasingly to 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、at
B、by
C、in
D、on

答案D

解析 惯用衔接题。concentrate on意为“专注于…”,故答案为[D]on。此处是说,但是许多航空公司近些年过于注重通过数量来吸引乘客,他们可能因此受到指责。
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