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  3. Boeing Co’s Sonic Cruiser, a proposed faster airliner, would be mostly blended material, program director Walt Gillette said rec

Boeing Co’s Sonic Cruiser, a proposed faster airliner, would be mostly blended material, program director Walt Gillette said rec

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问题        Boeing Co’s Sonic Cruiser, a proposed faster airliner, would be mostly blended material, program director Walt Gillette said recently. In its quest for the  【21】______   to fly 15 to 20 per cent faster than  【22】______   airliners, the US company says about 60 per cent of the new plane’s  【23】______  , including the wing, would be a carbon-fiber-reinforced composite material that is lighter than aluminum for the same  【24】______  . "Composites would  【25】______   almost all of the airplane that you could see from the outside," Gillette said. Composites are well regarded among aeronautical engineers and have been in  【26】______   use since the 1970s. Each generation of planes has more composites, and Gillette  【27】______   that about 10 per cent of Boeing’s  【28】______   civil aircraft, the early-1990s 777, is built 【29】______  the material. 【30】______  still only a proposal, the Sonic Cruiser has  【31】______   the interest of many airlines, which expressed unusual enthusiasm for the aircraft 【32】______  the September 11 attacks forced most of them to scale back operations. When Boeing 【33】______  the Sonic Cruiser last year it said the plane might enter service 【34】______  2006 and 2008. Gillette said the  【35】______   date now is 2008, by which time the market and technology are expected to have developed  【36】______  Wind-tunnel tests  【37】______   the company’s computer calculations of optimal cruising speed for the plane at 95 to 98 per. cent of the speed of sound. Going faster than sound would use too much fuel and  【38】______   great  【39】______   on the aircraft’s engines. Gillette said the Sonic Cruiser 【40】______  be offered as a family of aircraft with 200 to 250 seats and a range of 6,500 to 9,000 nautical miles (12,000 to 16,700 kilometers).  
【21】
选项 A、proficiency
B、efficiency
C、affection
D、effective
答案B
解析
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