[解析]
(1)C.细节理解题。根据原文第二段"The new train model,called the Coradia iLint,signals the beginning of efforts in Germany and other nations to move away from pollution﹣producing diesel(柴油) trains.这种名为Coradia iLint的新型列车标志着德国和其他国家开始努力摆脱产生污染的柴油列车。"可知建造新型火车的目的是替换原来的柴油火车,从而摆脱污染。C.To replace diesel trains.(替换柴油火车)正确。故选C.
(2)C.细节理解题。根据原文第六段"Hydrogen﹣powered trains cost more than diesel trains to build.But Alstom officials say the operating costs are much lower.氢动力列车的造价高于柴油列车。但阿尔斯通官员表示,运营成本要低得多。"可知氢动力火车的运行成本比较低。C.It costs much less to run.(它的运行成本更少)正确。故选C.
(3)D.推理判断题。根据原文第三段" The Coradia iLint is designed to run on non﹣electrified train lines with low levels of noise.Coradia iLint设计用于非电气化火车线路,噪音低。"及第四段"The only emissions (排放物) are water and steam.唯一的排放物是水和蒸汽。"可知新的氢动力火车具有低噪音的特点 ,且其唯一的排放物是水和蒸汽,所以是环保的。D.are environmentally friendly.(对环境友好)正确。故选D.
(4)A.标题判断题。通读全文,可知本文主要介绍的是一种新型的氢动力火车的研制及其特点。因此A.World's First Hydrogen Trains.(世界上第一辆氢动力列车)为本文最佳标题。故选A.