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【单选题】JimBoon is a hybrid kind of guy. He drives a Toyota hybrid to work, a Honda hybrid on weekends and, as a manager for Seattle public transit he recently placed the world’s largest order for hybrid electric buses.
Now, with the biggest hybrid-bus fleet in the world, Seattle has become the main testing ground for a technology that claims it can drastically cut air pollution and fuel consumption. In the 1990s, demo fleets of 35 buses or fewer started cropping up in cities such as Tempe,Ariz. Sixteen of these early hybrids still service Genoa, Italy, where drivers switch from diesel to electric power when passing the city’s downtown architectural treasures.But no city has gone as far as Seattle, which last year bought 235 GM hybrid buses at $ 645,000 a pop. When the final one rolls out thisDecember, the region’s bus system will be 15 percent hybriD、
But why Seattle, and why now The Pacific Northwest has long been a hotbed of both Green politics and cutting-edge technology. Fourteen years ago the Seattle area bought 236 Italian-madeBreda buses to service a mile-long downtown tunnel. They were supposed to operate as clean electric trolleys underground, but the switching mechanism often failed and "the bus drove through the tunnel as a diesel," saysBoon. "It was pretty loud and smoky. "
When theBredas hit retirement age in 2002,Boon went shopping. He chose the GM buses because they use an automatic transmission and diesel boosters that provide power to scale inclines without strain. In hilly Seattle, the prospect of a hybrid that could climb like a diesel but accelerate without belching black fumes helped justify a price $ 200,000 higher than that of a regular bus. "The days of seeing a diesel pull away and pour out smoke are over," saysBoon. "After we drove these hybrid buses across the country, I wiped a handkerchief inside the tailpipe. It came out spotless. "
Experts say buses are critical to realizing the hybrid dream of greater efficiency and cleaner air. It would take thousands of hybrid cars to save as many gallons of gas (750,000) asBoon expects his buses to save Seattle each year. GM claims that compared with conventional diesels, its new buses also churn out 90 percent less particulate matter—a known carcinogen. "Buses are a major source of pollution in any city," saysDave Kircher of the Puget SoundCleanAirAgency. "They operate where people are breathing this exhaust, so this is a major step forward in terms of emissions. "
And a major step forward in the marketplace: Philadelphia, Honolulu, LongBeach,Calif., andAlbuquerque, N. M. , have all bought the GM buses in recent months. GM is now touting itself in ads as the top hybrid-bus innovator, but Siemens is among the global giants dueling GM for new business, and New York plans to deploy 325BAE、Systems hybrids by 2006. "There’s room for competition," says JamesCannon, editor of Hybrid Vehicles newsletter. Seems Seattle isn’t the only city trying to leave grunge behinD、
Why are buses critical to realizing the hybrid dream of higher efficiencyA．Buses are a major source of pollution.
B．A、single bus saves much more gas than a single car.
C．Buses carry more passengers.
D．New buses produce less harmful material.

网考网参考答案：B
网考网解析：
[考点] 事实细节 [解析] 解答本题应定位到原文第五段。第五段首句提出了专家的一种看法“专家认为公共汽车是实现高功效和高清洁混合动力梦想的关键”。而在其后的句子中给出了专家持有这种看法的原因“上千辆混合动力小汽车节省下来的汽油(750，000加仑)才和布恩预计他的公共汽车每年为西雅图节省的石油一样多”，由此可知B选项是对原文的同义置换，为正确答案。 [干扰项分析] A、D选项均是在原文出现的信息，A选项是在陈述一个客观事实，D选项用以介绍新型公汽的高清洁性能，但这都不是解释公交汽车是实现高效混合动力梦想的关键的原因，C选项是原文没有提到的编造信息。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>