Many industries have good reason for caution at the moment, given the fears of a "double dip" in the world economy. But the mood

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问题     Many industries have good reason for caution at the moment, given the fears of a "double dip" in the world economy. But the mood in aviation,【C1】______among the aircraftmakers, remains【C2】______. This week Airbus produced new long-range forecasts, predicting that a【C3】______of vigorous emerging-market growth and the need to【C4】______ageing and inefficient planes in the rich countries will mean a demand, between now and 2030, for almost 28,000 large aircraft worth $ 3. 5 trillion.
    The aircraftmakers’【C5】______about the emerging world is based on what appears to be an iron law of aviation: rising numbers of urban middle-class people will mean rising demand for air travel, 【C6】______short-term downturn the economy suffers. Since the 1970s, 【C7】______oil shocks, Middle East wars, terrorist attacks and disease outbreaks, the number of passenger-miles flown seems always to have【C8】______back to its long-term growth【C9】______. At the moment Airbus【C10】______there are 39 "megacities" worldwide whose airports【C11】______more than 10,000 long-haul passengers a day. In 20 years it expects there to be almost 90 such cities, many of them in Asia.
    There is still plenty of【C12】______for growth in the rich world too, but a second important【C13】______of demand for new planes in these countries will be airlines’ desire to【C14】______on fuel and maintenance costs, especially【C15】______new taxes on emissions come into【C16】______, by【C17】______their old aircraft with shiny new planes. Airbus points out that the industry has already been doing pretty well on this【C18】______: in the past ten years, passenger-miles flown have risen by 45% but the airlines’ use of jet fuel has gone up by just 3%. In large part that is because of more【C19】______aircraft, and there are more such gains to come. Airbus says the reengined "neo" version of its single-aisle A320 plane, 【C20】______to fly in late 2015, will burn 15% less fuel than the current version. [309 words]
【C20】

选项 A、long
B、apt
C、ought
D、due

答案D

解析 本题考查句内语义。
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