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车辆生产率是反映汽车运输企业营运车辆运用效的综合指标，主要通过单车期产量、车吨(座)期产量和实载率指标来反映。（）
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高速公路常用的波形梁护栏属于半柔性护栏。（）
某公交线路长度为15千米，车辆完成一个周转所耗费的时间为120分钟，则车辆的营运速度为（）千米／小时。
Dear Sir,
After reading some of the letters printed in this newspaper, I'm beginning to believe that the carbon monoxide in this city's air during the past year has already affected some people's ability to think straight.
The proposal for limiting the use of ears seems fair and reasonable to me. I can't feel that it will produce any real suffering on the part of motorists, who sometimes seem to put their rights to drive above the public's right to breathe.
Surely everyone understand that it would be worse to have to wear gas masks in our city than to ride buses or trains. After all, breathing is necessary, and we might all breathe more easily ff we could reduce the amount of pollution in our air.
The letters referred to in the first paragraph must have ______.
Carnegie Hall, the famous concert hall in New York City, has again undergone a restoration. While this is not the first, it is certainly the most extensive in the building's history. As a result of this restoration, Carnegie Hall once again has the quality of sound that it had when it was first built.
Carnegie Hall owes its existence to Andrew Carnegie, the wealthy owner of a steel company in the late 1800s. The hall was finished in 1891 and quickly gained a reputation as an excellent performing arts hall where accomplished musicians gained fame. Despite its reputation, however, the concert hall suffered from several detrimental renovations over the years. During the Great Depression, when fewer people could afford to attend performances, the directors sold part of the building to commercial businesses. As a result, a coffee shop was opened in one comer of the building, for which the builders replaced the brick and terra cotta walls with windowpanes. A renovation in 1946 seriously damaged the acoustical quality of the hall when the makers of the film Carnegie Hall cut a gaping hole in the dome of the ceiling to allow for lights and air vents. The hole was later covered with short Curtains and a fake ceiling, but the hall never sounded the same afterwards.
In 1960, the violinist Isaac Stem became involved in restoring the hall after a group of real estate developers unveiled plans to demolish Carnegie Hall and build a high-rise office building on the site, This threat spurred Stern to rally public support for Carnegie Hall and encourage the City of New York to buy the property. The movement was successful, and the concert hall is now owned by the city. In the current restoration, builders tested each new material for its sound qualities, and they replaced the hole in the ceiling with a dome. The builders also restored the outer walls to their original appearance and closed the coffee shop. Carnegie has never sounded better, and its prospects for the future have never looked more promising.
The passage is mainly about ______.
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