《把铁路修到拉萨去》的主要内容，和每一段的段意。 急速！！！！ 《把铁路修到拉萨去》最短的主要内容，急速！

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1、课文简说
这是一篇充满了昂扬向上的精神和英雄气概的文章。文章记叙了在高寒缺氧，自然环境恶劣，生态环境脆弱，施工条件异常艰苦的情况下，西部建设者们以智慧和力量克服了一个个世界级难题，攻克了国际性技术难关，创下了世界铁路建设奇迹，那就是当今世界上海拔最高的隧道——风火山隧道贯通的经过。文章条理清楚，数据详实，字里行间包含着对西部建设者智慧与力量、吃苦奉献精神的歌颂。
这篇通讯字里行间洋溢着浓郁的抒情色彩。作者主要采用这样几种抒情方法：一是直抒胸臆，通过8个感情色彩强烈的感叹句，充分表达了筑路大军的信心与决心以及所遇困难的严峻以及克服困难和取得胜利的喜悦之情。二是运用恰当的比喻，如，“铁龙”“下马威”“逞凶一时的冻土”“巨大的拦路虎”，更加突出了建设者的豪情壮志。三是语言直白简洁，有很强的节奏感，字里行间充溢着乐观情怀。
2、词句解析
(1)对句子的理解。
①把铁路修到拉萨去!
这句话既是课文的题目，又在文中一咏三叹，反复出现了四次。这个简短有力的句子，铿锵有力，掷地有声，既是筑路大军的誓词，也是作者行文的线索。
要在青藏高原修铁路，让火车开到拉萨，当时国内外都是一片质疑声。而这句朴素无华的话语充满着信心与决心，在文中的四次出现均使用了感叹号，充分反映了建设者们排除万难、不达目的不罢休的执著精神。这句话在开工前、遇到困难和克服困难时反复出现，在文中前呼后应，与尾句“拉萨已经遥遥在望”形成一条穿珠的彩线。
1、课文简说
这是一篇充满了昂扬向上的精神和英雄气概的文章。文章记叙了在高寒缺氧，自然环境恶劣，生态环境脆弱，施工条件异常艰苦的情况下，西部建设者们以智慧和力量克服了一个个世界级难题，攻克了国际性技术难关，创下了世界铁路建设奇迹，那就是当今世界上海拔最高的隧道——风火山隧道贯通的经过。文章条理清楚，数据详实，字里行间包含着对西部建设者智慧与力量、吃苦奉献精神的歌颂。
这篇通讯字里行间洋溢着浓郁的抒情色彩。作者主要采用这样几种抒情方法：一是直抒胸臆，通过8个感情色彩强烈的感叹句，充分表达了筑路大军的信心与决心以及所遇困难的严峻以及克服困难和取得胜利的喜悦之情。二是运用恰当的比喻，如，“铁龙”“下马威”“逞凶一时的冻土”“巨大的拦路虎”，更加突出了建设者的豪情壮志。三是语言直白简洁，有很强的节奏感，字里行间充溢着乐观情怀。
2、词句解析
(1)对句子的理解。
①把铁路修到拉萨去!
这句话既是课文的题目，又在文中一咏三叹，反复出现了四次。这个简短有力的句子，铿锵有力，掷地有声，既是筑路大军的誓词，也是作者行文的线索。
要在青藏高原修铁路，让火车开到拉萨，当时国内外都是一片质疑声。而这句朴素无华的话语充满着信心与决心，在文中的四次出现均使用了感叹号，充分反映了建设者们排除万难、不达目的不罢休的执著精神。这句话在开工前、遇到困难和克服困难时反复出现，在文中前呼后应，与尾句“拉萨已经遥遥在望”形成一条穿珠的彩线。
②一条长长的“铁龙”，从柴达木盆地深处的工业新城格尔木起步，跨过巍峨的昆仑山，将通过这里，越过“世界屋脊”青藏高原，到达雪域圣城——拉萨。这就是西部大开发的标志性工程青藏铁路，这就是造福广大人民的青藏铁路。
建设青藏铁路是党中央和国务院在新世纪之初作出的战略决策，是西部大开发的标志性工程，对加快东西部沟通往来和青藏两省区的经济、社会发展，增进民族团结，造福各族人民具有重要意义。
③难怪一些西方媒体预言：中国人要在这样不良的地质上打隧道，是根本不可能的事!
“根本不可能”意思是这样的隧道绝无打通的希望。结合全文可以知道在海拔4 905米的风火山上，冻土层、冰岩都是“世界级”难题，需要先进的科学技术，难怪西方媒体如此预言。这句话更加强调了工程艰巨、要求很高、难度很大，衬托出了西部建设者们的勇敢、实干与创新精神。
④风火山，这座万年冰山露出了狰狞的面目，给筑路大军来一个下马威!
“狰狞”，面目凶恶的样子。“下马威”一开始就向对方显示威势。文中指刚开工时，就遇到控制温度的难题：温度太低，混凝土无法凝固；增温则洞壁遇热融化，造成洞壁塌滑。这些困难，都属于世界级难题。
(2)对词语的理解。
银装素裹：素，没有染色的。裹，包，缠。从上到下没有一点彩色，非常素洁。文中指风火山被冰雪覆盖的样子。
七零八落：形容零散稀疏的样子。特指原来又多又整齐的东西现在零散了。文中指保温大棚被狂风破坏而零乱不堪的场面。
不翼而飞：形容东西突然丢失。文中指风火山上的天气极其恶劣，狂风能将屋顶的铁皮瓦刮走。
劈头盖脸：从正前方正对着头和脸劈下来、盖下来。文中指气候恶劣，不给人们任何预防和躲避时间，一场冰雹就突如其来地袭击了筑路大军。
杯水车薪：比喻无济于事，解决不了问题。文中指风火山海拔高，氧气含量不到平原的一半，氧气瓶所提供的氧气满足不了人正常的生理需要。筑路大军的生命面临严重威胁。
废寝忘食：顾不上吃饭，忘记了睡觉。形容勤奋专心。文中指科技人员夜以继日地实验、攻关，为攻克世界级难题勤奋工作。
3、课文相关资料
拉萨西藏自治区首府，一座具有1300年历史的古城，位于雅鲁藏布江支流拉萨河北岸，海拔三千六百五十多米。“拉萨”在藏文中为“圣地”或“佛地”之意，长期以来就是西藏政治、经济、文化、宗教的中心。金碧辉煌、雄伟壮丽的布达拉宫，是至高无上政教合一政权的象征。早在公元7世纪，松赞干布兼并邻近部落、统一西藏后，就从雅隆迁都逻姿(即今拉萨)，建立吐蕃王朝。1951年5月23日，西藏和平解放，拉萨城进入了新的时代。1960年，国务院正式批准拉萨为地级市，1982年又将其定为国家首批公布的24座历史文化名城之一。
青藏铁路是世界上海拔最高、线路最长、穿越冻土里程最长的高原铁路。翻越唐古拉山的铁路最高点海拔5 072米，经过海拔4 000米以上地段960公里，连续多年冻土区550公里以上。新中国成立不久，国家有关部门就着手研究进藏铁路问题。在毛泽东、周恩来、邓小平等老一辈领导人的亲切关怀下，青藏铁路一期工程西宁至格尔木段1958年开工，1984年交付营运。但是，限于当时的经济实力和高原、冻土等筑路技术难题尚未解决，格尔木至拉萨段停建；二期工程格尔木至拉萨段于2001年6月29日开工，全长1 142公里，计划投资262亿元。
建设青藏铁路是党中央、国务院在新世纪之初作出的战略决策，是西部大开发的标志性工程，对加快青藏两省区的经济、社会发展，增进民族团结，造福各族人民，具有重要意义。
2005年，是被人们称为“天路”的青藏铁路铺轨建设的决战之年，年底将完成铺轨工作，2007年7月将正式通车运行。
青藏铁路的建设，有着重大的政治意义、历史意义、民族意义、地区意义，也有着重大的政治意义、历史意义、民族意义、地区意义，也有着重要的经济意义。

1、课文简说
这是一篇充满了昂扬向上的精神和英雄气概的文章。文章记叙了在高寒缺氧，自然环境恶劣，生态环境脆弱，施工条件异常艰苦的情况下，西部建设者们以智慧和力量克服了一个个世界级难题，攻克了国际性技术难关，创下了世界铁路建设奇迹，那就是当今世界上海拔最高的隧道——风火山隧道贯通的经过。文章条理清楚，数据详实，字里行间包含着对西部建设者智慧与力量、吃苦奉献精神的歌颂。
这篇通讯字里行间洋溢着浓郁的抒情色彩。作者主要采用这样几种抒情方法：一是直抒胸臆，通过8个感情色彩强烈的感叹句，充分表达了筑路大军的信心与决心以及所遇困难的严峻以及克服困难和取得胜利的喜悦之情。二是运用恰当的比喻，如，“铁龙”“下马威”“逞凶一时的冻土”“巨大的拦路虎”，更加突出了建设者的豪情壮志。三是语言直白简洁，有很强的节奏感，字里行间充溢着乐观情怀。
2、词句解析
(1)对句子的理解。
①把铁路修到拉萨去!
这句话既是课文的题目，又在文中一咏三叹，反复出现了四次。这个简短有力的句子，铿锵有力，掷地有声，既是筑路大军的誓词，也是作者行文的线索。
要在青藏高原修铁路，让火车开到拉萨，当时国内外都是一片质疑声。而这句朴素无华的话语充满着信心与决心，在文中的四次出现均使用了感叹号，充分反映了建设者们排除万难、不达目的不罢休的执著精神。这句话在开工前、遇到困难和克服困难时反复出现，在文中前呼后应，与尾句“拉萨已经遥遥在望”形成一条穿珠的彩线。
②一条长长的“铁龙”，从柴达木盆地深处的工业新城格尔木起步，跨过巍峨的昆仑山，将通过这里，越过“世界屋脊”青藏高原，到达雪域圣城——拉萨。这就是西部大开发的标志性工程青藏铁路，这就是造福广大人民的青藏铁路。
建设青藏铁路是党中央和国务院在新世纪之初作出的战略决策，是西部大开发的标志性工程，对加快东西部沟通往来和青藏两省区的经济、社会发展，增进民族团结，造福各族人民具有重要意义。
③难怪一些西方媒体预言：中国人要在这样不良的地质上打隧道，是根本不可能的事!
“根本不可能”意思是这样的隧道绝无打通的希望。结合全文可以知道在海拔4 905米的风火山上，冻土层、冰岩都是“世界级”难题，需要先进的科学技术，难怪西方媒体如此预言。这句话更加强调了工程艰巨、要求很高、难度很大，衬托出了西部建设者们的勇敢、实干与创新精神。
④风火山，这座万年冰山露出了狰狞的面目，给筑路大军来一个下马威!
“狰狞”，面目凶恶的样子。“下马威”一开始就向对方显示威势。文中指刚开工时，就遇到控制温度的难题：温度太低，混凝土无法凝固；增温则洞壁遇热融化，造成洞壁塌滑。这些困难，都属于世界级难题。
(2)对词语的理解。
银装素裹：素，没有染色的。裹，包，缠。从上到下没有一点彩色，非常素洁。文中指风火山被冰雪覆盖的样子。
七零八落：形容零散稀疏的样子。特指原来又多又整齐的东西现在零散了。文中指保温大棚被狂风破坏而零乱不堪的场面。
不翼而飞：形容东西突然丢失。文中指风火山上的天气极其恶劣，狂风能将屋顶的铁皮瓦刮走。
劈头盖脸：从正前方正对着头和脸劈下来、盖下来。文中指气候恶劣，不给人们任何预防和躲避时间，一场冰雹就突如其来地袭击了筑路大军。
杯水车薪：比喻无济于事，解决不了问题。文中指风火山海拔高，氧气含量不到平原的一半，氧气瓶所提供的氧气满足不了人正常的生理需要。筑路大军的生命面临严重威胁。
废寝忘食：顾不上吃饭，忘记了睡觉。形容勤奋专心。文中指科技人员夜以继日地实验、攻关，为攻克世界级难题勤奋工作。
3、课文相关资料
拉萨西藏自治区首府，一座具有1300年历史的古城，位于雅鲁藏布江支流拉萨河北岸，海拔三千六百五十多米。“拉萨”在藏文中为“圣地”或“佛地”之意，长期以来就是西藏政治、经济、文化、宗教的中心。金碧辉煌、雄伟壮丽的布达拉宫，是至高无上政教合一政权的象征。早在公元7世纪，松赞干布兼并邻近部落、统一西藏后，就从雅隆迁都逻姿(即今拉萨)，建立吐蕃王朝。1951年5月23日，西藏和平解放，拉萨城进入了新的时代。1960年，国务院正式批准拉萨为地级市，1982年又将其定为国家首批公布的24座历史文化名城之一。
青藏铁路是世界上海拔最高、线路最长、穿越冻土里程最长的高原铁路。翻越唐古拉山的铁路最高点海拔5 072米，经过海拔4 000米以上地段960公里，连续多年冻土区550公里以上。新中国成立不久，国家有关部门就着手研究进藏铁路问题。在毛泽东、周恩来、邓小平等老一辈领导人的亲切关怀下，青藏铁路一期工程西宁至格尔木段1958年开工，1984年交付营运。但是，限于当时的经济实力和高原、冻土等筑路技术难题尚未解决，格尔木至拉萨段停建；二期工程格尔木至拉萨段于2001年6月29日开工，全长1 142公里，计划投资262亿元。
建设青藏铁路是党中央、国务院在新世纪之初作出的战略决策，是西部大开发的标志性工程，对加快青藏两省区的经济、社会发展，增进民族团结，造福各族人民，具有重要意义。2005年，是被人们称为“天路”的青藏铁路铺轨建设的决战之年，年底将完成铺轨工作，2007年7月将正式通车运行。
青藏铁路的建设，有着重大的政治意义、历史意义、民族意义、地区意义，也有着重大的政治意义、历史意义、民族意义、地区意义，也有着重要的经济意义。

1、课文简说
这是一篇充满了昂扬向上的精神和英雄气概的文章。文章记叙了在高寒缺氧，自然环境恶劣，生态环境脆弱，施工条件异常艰苦的情况下，西部建设者们以智慧和力量克服了一个个世界级难题，攻克了国际性技术难关，创下了世界铁路建设奇迹，那就是当今世界上海拔最高的隧道——风火山隧道贯通的经过。文章条理清楚，数据详实，字里行间包含着对西部建设者智慧与力量、吃苦奉献精神的歌颂。
这篇通讯字里行间洋溢着浓郁的抒情色彩。作者主要采用这样几种抒情方法：一是直抒胸臆，通过8个感情色彩强烈的感叹句，充分表达了筑路大军的信心与决心以及所遇困难的严峻以及克服困难和取得胜利的喜悦之情。二是运用恰当的比喻，如，“铁龙”“下马威”“逞凶一时的冻土”“巨大的拦路虎”，更加突出了建设者的豪情壮志。三是语言直白简洁，有很强的节奏感，字里行间充溢着乐观情怀。
2、词句解析
(1)对句子的理解。
①把铁路修到拉萨去!
这句话既是课文的题目，又在文中一咏三叹，反复出现了四次。这个简短有力的句子，铿锵有力，掷地有声，既是筑路大军的誓词，也是作者行文的线索。
要在青藏高原修铁路，让火车开到拉萨，当时国内外都是一片质疑声。而这句朴素无华的话语充满着信心与决心，在文中的四次出现均使用了感叹号，充分反映了建设者们排除万难、不达目的不罢休的执著精神。这句话在开工前、遇到困难和克服困难时反复出现，在文中前呼后应，与尾句“拉萨已经遥遥在望”形成一条穿珠的彩线。
②一条长长的“铁龙”，从柴达木盆地深处的工业新城格尔木起步，跨过巍峨的昆仑山，将通过这里，越过“世界屋脊”青藏高原，到达雪域圣城——拉萨。这就是西部大开发的标志性工程青藏铁路，这就是造福广大人民的青藏铁路。
建设青藏铁路是党中央和国务院在新世纪之初作出的战略决策，是西部大开发的标志性工程，对加快东西部沟通往来和青藏两省区的经济、社会发展，增进民族团结，造福各族人民具有重要意义。
③难怪一些西方媒体预言：中国人要在这样不良的地质上打隧道，是根本不可能的事!
“根本不可能”意思是这样的隧道绝无打通的希望。结合全文可以知道在海拔4 905米的风火山上，冻土层、冰岩都是“世界级”难题，需要先进的科学技术，难怪西方媒体如此预言。这句话更加强调了工程艰巨、要求很高、难度很大，衬托出了西部建设者们的勇敢、实干与创新精神。
④风火山，这座万年冰山露出了狰狞的面目，给筑路大军来一个下马威!
“狰狞”，面目凶恶的样子。“下马威”一开始就向对方显示威势。文中指刚开工时，就遇到控制温度的难题：温度太低，混凝土无法凝固；增温则洞壁遇热融化，造成洞壁塌滑。这些困难，都属于世界级难题。
(2)对词语的理解。
银装素裹：素，没有染色的。裹，包，缠。从上到下没有一点彩色，非常素洁。文中指风火山被冰雪覆盖的样子。
七零八落：形容零散稀疏的样子。特指原来又多又整齐的东西现在零散了。文中指保温大棚被狂风破坏而零乱不堪的场面。
不翼而飞：形容东西突然丢失。文中指风火山上的天气极其恶劣，狂风能将屋顶的铁皮瓦刮走。
劈头盖脸：从正前方正对着头和脸劈下来、盖下来。文中指气候恶劣，不给人们任何预防和躲避时间，一场冰雹就突如其来地袭击了筑路大军。
杯水车薪：比喻无济于事，解决不了问题。文中指风火山海拔高，氧气含量不到平原的一半，氧气瓶所提供的氧气满足不了人正常的生理需要。筑路大军的生命面临严重威胁。
废寝忘食：顾不上吃饭，忘记了睡觉。形容勤奋专心。文中指科技人员夜以继日地实验、攻关，为攻克世界级难题勤奋工作。
3、课文相关资料
拉萨西藏自治区首府，一座具有1300年历史的古城，位于雅鲁藏布江支流拉萨河北岸，海拔三千六百五十多米。“拉萨”在藏文中为“圣地”或“佛地”之意，长期以来就是西藏政治、经济、文化、宗教的中心。金碧辉煌、雄伟壮丽的布达拉宫，是至高无上政教合一政权的象征。早在公元7世纪，松赞干布兼并邻近部落、统一西藏后，就从雅隆迁都逻姿(即今拉萨)，建立吐蕃王朝。1951年5月23日，西藏和平解放，拉萨城进入了新的时代。1960年，国务院正式批准拉萨为地级市，1982年又将其定为国家首批公布的24座历史文化名城之一。
青藏铁路是世界上海拔最高、线路最长、穿越冻土里程最长的高原铁路。翻越唐古拉山的铁路最高点海拔5 072米，经过海拔4 000米以上地段960公里，连续多年冻土区550公里以上。新中国成立不久，国家有关部门就着手研究进藏铁路问题。在毛泽东、周恩来、邓小平等老一辈领导人的亲切关怀下，青藏铁路一期工程西宁至格尔木段1958年开工，1984年交付营运。但是，限于当时的经济实力和高原、冻土等筑路技术难题尚未解决，格尔木至拉萨段停建；二期工程格尔木至拉萨段于2001年6月29日开工，全长1 142公里，计划投资262亿元。
建设青藏铁路是党中央、国务院在新世纪之初作出的战略决策，是西部大开发的标志性工程，对加快青藏两省区的经济、社会发展，增进民族团结，造福各族人民，具有重要意义。2005年，是被人们称为“天路”的青藏铁路铺轨建设的决战之年，年底将完成铺轨工作，2007年7月将正式通车运行。
青藏铁路的建设，有着重大的政治意义、历史意义、民族意义、地区意义，也有着重大的政治意义、历史意义、民族意义、地区意义，也有着重要的经济意义。

青藏铁路是世界上海拔最高，线路最长的高原铁路。其中格尔木至拉萨段全长1142公里，经过海拔4000米以上地段960公里，翻越唐古拉山的铁路最高点海拔5072米。沿线地质复杂，经过连续多年冻土地段550公里。全线桥隧总长约占线路总长的8％。国家总投资262.1亿元，原定工期6年。设计运送能力为客车8对，单项货流密度500万吨。
青藏高原高寒缺氧，生态环境极其脆弱。铁路经过可可西里、三江源、羌塘等自然保护区，全线投入20亿元用于环保工程，主要用于途经地区的草甸、灌木丛地带的植被移植养护、修建30处野生动物的通道，以及进行冻土区植被恢复试验研究。

这是一篇充满了昂扬向上的精神和英雄气概的文章。文章记叙了在高寒缺氧，自然环境恶劣，生态环境脆弱，施工条件异常艰苦的情况下，西部建设者们一智慧和力量克服了一个个世界级难题，攻克了国际性技术难关，创下了世界铁路建设奇迹，那就是当今世界上海拔最高的隧道-----风火山隧道贯通。

1、课文简说
这是一篇充满了昂扬向上的精神和英雄气概的文章。文章记叙了在高寒缺氧，自然环境恶劣，生态环境脆弱，施工条件异常艰苦的情况下，西部建设者们以智慧和力量克服了一个个世界级难题，攻克了国际性技术难关，创下了世界铁路建设奇迹，那就是当今世界上海拔最高的隧道——风火山隧道贯通的经过。文章条理清楚，数据详实，字里行间包含着对西部建设者智慧与力量、吃苦奉献精神的歌颂。
这篇通讯字里行间洋溢着浓郁的抒情色彩。作者主要采用这样几种抒情方法：一是直抒胸臆，通过8个感情色彩强烈的感叹句，充分表达了筑路大军的信心与决心以及所遇困难的严峻以及克服困难和取得胜利的喜悦之情。二是运用恰当的比喻，如，“铁龙”“下马威”“逞凶一时的冻土”“巨大的拦路虎”，更加突出了建设者的豪情壮志。三是语言直白简洁，有很强的节奏感，字里行间充溢着乐观情怀。
2、词句解析
(1)对句子的理解。
①把铁路修到拉萨去!
这句话既是课文的题目，又在文中一咏三叹，反复出现了四次。这个简短有力的句子，铿锵有力，掷地有声，既是筑路大军的誓词，也是作者行文的线索。
要在青藏高原修铁路，让火车开到拉萨，当时国内外都是一片质疑声。而这句朴素无华的话语充满着信心与决心，在文中的四次出现均使用了感叹号，充分反映了建设者们排除万难、不达目的不罢休的执著精神。这句话在开工前、遇到困难和克服困难时反复出现，在文中前呼后应，与尾句“拉萨已经遥遥在望”形成一条穿珠的彩线。
②一条长长的“铁龙”，从柴达木盆地深处的工业新城格尔木起步，跨过巍峨的昆仑山，将通过这里，越过“世界屋脊”青藏高原，到达雪域圣城——拉萨。这就是西部大开发的标志性工程青藏铁路，这就是造福广大人民的青藏铁路。
建设青藏铁路是党中央和国务院在新世纪之初作出的战略决策，是西部大开发的标志性工程，对加快东西部沟通往来和青藏两省区的经济、社会发展，增进民族团结，造福各族人民具有重要意义。
③难怪一些西方媒体预言：中国人要在这样不良的地质上打隧道，是根本不可能的事!
“根本不可能”意思是这样的隧道绝无打通的希望。结合全文可以知道在海拔4 905米的风火山上，冻土层、冰岩都是“世界级”难题，需要先进的科学技术，难怪西方媒体如此预言。这句话更加强调了工程艰巨、要求很高、难度很大，衬托出了西部建设者们的勇敢、实干与创新精神。
④风火山，这座万年冰山露出了狰狞的面目，给筑路大军来一个下马威!
“狰狞”，面目凶恶的样子。“下马威”一开始就向对方显示威势。文中指刚开工时，就遇到控制温度的难题：温度太低，混凝土无法凝固；增温则洞壁遇热融化，造成洞壁塌滑。这些困难，都属于世界级难题。
(2)对词语的理解。
银装素裹：素，没有染色的。裹，包，缠。从上到下没有一点彩色，非常素洁。文中指风火山被冰雪覆盖的样子。
七零八落：形容零散稀疏的样子。特指原来又多又整齐的东西现在零散了。文中指保温大棚被狂风破坏而零乱不堪的场面。
不翼而飞：形容东西突然丢失。文中指风火山上的天气极其恶劣，狂风能将屋顶的铁皮瓦刮走。
劈头盖脸：从正前方正对着头和脸劈下来、盖下来。文中指气候恶劣，不给人们任何预防和躲避时间，一场冰雹就突如其来地袭击了筑路大军。
杯水车薪：比喻无济于事，解决不了问题。文中指风火山海拔高，氧气含量不到平原的一半，氧气瓶所提供的氧气满足不了人正常的生理需要。筑路大军的生命面临严重威胁。
废寝忘食：顾不上吃饭，忘记了睡觉。形容勤奋专心。文中指科技人员夜以继日地实验、攻关，为攻克世界级难题勤奋工作。
3、课文相关资料
拉萨西藏自治区首府，一座具有1300年历史的古城，位于雅鲁藏布江支流拉萨河北岸，海拔三千六百五十多米。“拉萨”在藏文中为“圣地”或“佛地”之意，长期以来就是西藏政治、经济、文化、宗教的中心。金碧辉煌、雄伟壮丽的布达拉宫，是至高无上政教合一政权的象征。早在公元7世纪，松赞干布兼并邻近部落、统一西藏后，就从雅隆迁都逻姿(即今拉萨)，建立吐蕃王朝。1951年5月23日，西藏和平解放，拉萨城进入了新的时代。1960年，国务院正式批准拉萨为地级市，1982年又将其定为国家首批公布的24座历史文化名城之一。
青藏铁路是世界上海拔最高、线路最长、穿越冻土里程最长的高原铁路。翻越唐古拉山的铁路最高点海拔5 072米，经过海拔4 000米以上地段960公里，连续多年冻土区550公里以上。新中国成立不久，国家有关部门就着手研究进藏铁路问题。在毛泽东、周恩来、邓小平等老一辈领导人的亲切关怀下，青藏铁路一期工程西宁至格尔木段1958年开工，1984年交付营运。但是，限于当时的经济实力和高原、冻土等筑路技术难题尚未解决，格尔木至拉萨段停建；二期工程格尔木至拉萨段于2001年6月29日开工，全长1 142公里，计划投资262亿元。
建设青藏铁路是党中央、国务院在新世纪之初作出的战略决策，是西部大开发的标志性工程，对加快青藏两省区的经济、社会发展，增进民族团结，造福各族人民，具有重要意义。2005年，是被人们称为“天路”的青藏铁路铺轨建设的决战之年，年底将完成铺轨工作，2007年7月将正式通车运行。
青藏铁路的建设，有着重大的政治意义、历史意义、民族意义、地区意义，也有着重要的经济意义。

主要内容
这是一篇充满了昂扬向上的精神和英雄气概的文章。文章记叙了在高寒缺氧，自然环境恶劣，生态环境脆弱，施工条件异常艰苦的情况下，西部建设者们以智慧和力量克服了一个个世界级难题，攻克了国际性技术难关，创下了世界铁路建设奇迹，那就是当今世界上海拔最高的隧道——风火山隧道贯通的经过。文章条理清楚，数据详实，字里行间包含着对西部建设者智慧与力量、吃苦奉献精神的歌颂。
这篇通讯字里行间洋溢着浓郁的抒情色彩。作者主要采用这样几种抒情方法：一是直抒胸臆，通过8个感情色彩强烈的感叹句，充分表达了筑路大军的信心与决心以及所遇困难的严峻以及克服困难和取得胜利的喜悦之情。二是运用恰当的比喻，如，“铁龙”“下马威”“逞凶一时的冻土”“巨大的拦路虎”，更加突出了建设者的豪情壮志。三是语言直白简洁，有很强的节奏感，字里行间充溢着乐观情怀。
词句解析
(1)理解句意。
①把铁路修到拉萨去!
这句话既是课文的题目，又在文中一咏三叹，反复出现了四次。这个简短有力的句子，铿锵有力，掷地有声，既是筑路大军的誓词，也是作者行文的线索。
要在青藏高原修铁路，让火车开到拉萨，当时国内外都是一片质疑声。而这句朴素无华的话语充满着信心与决心，在文中的四次出现均使用了感叹号，充分反映了建设者们排除万难、不达目的不罢休的执著精神。这句话在开工前、遇到困难和克服困难时反复出现，在文中前呼后应，与尾句“拉萨已经遥遥在望”形成一条穿珠的彩线。
②一条长长的“铁龙”，从柴达木盆地深处的工业新城格尔木起步，跨过巍峨的昆仑山，将通过这里，越过“世界屋脊”青藏高原，到达雪域圣城——拉萨。这就是西部大开发的标志性工程青藏铁路，这就是造福广大人民的青藏铁路。
建设青藏铁路是党中央和国务院在新世纪之初作出的战略决策，是西部大开发的标志性工程，对加快东西部沟通往来和青藏两省区的经济、社会发展，增进民族团结，造福各族人民具有重要意义。
③难怪一些西方媒体预言：中国人要在这样不良的地质上打隧道，是根本不可能的事!
“根本不可能”意思是这样的隧道绝无打通的希望。结合全文可以知道在海拔4 905米的风火山上，冻土层、冰岩都是“世界级”难题，需要先进的科学技术，难怪西方媒体如此预言。这句话更加强调了工程艰巨、要求很高、难度很大，衬托出了西部建设者们的勇敢、实干与创新精神。
④风火山，这座万年冰山露出了狰狞的面目，给筑路大军来一个下马威!
“狰狞”，面目凶恶的样子。“下马威”一开始就向对方显示威势。文中指刚开工时，就遇到控制温度的难题：温度太低，混凝土无法凝固；增温则洞壁遇热融化，造成洞壁塌滑。这些困难，都属于世界级难题。
(2)解释词语。
银装素裹：素，没有染色的。裹，包，缠。从上到下没有一点彩色，非常素洁。文中指风火山被冰雪覆盖的样子。
七零八落：形容零散稀疏的样子。特指原来又多又整齐的东西现在零散了。文中指保温大棚被狂风破坏而零乱不堪的场面。
不翼而飞：形容东西突然丢失。文中指风火山上的天气极其恶劣，狂风能将屋顶的铁皮瓦刮走。
劈头盖脸：从正前方正对着头和脸劈下来、盖下来。文中指气候恶劣，不给人们任何预防和躲避时间，一场冰雹就突如其来地袭击了筑路大军。
杯水车薪：比喻无济于事，解决不了问题。文中指风火山海拔高，氧气含量不到平原的一半，氧气瓶所提供的氧气满足不了人正常的生理需要。筑路大军的生命面临严重威胁。
废寝忘食：顾不上吃饭，忘记了睡觉。形容勤奋专心。文中指科技人员夜以继日地实验、攻关，为攻克世界级难题勤奋工作。

銆婃妸閾佽矾淇埌鎷夎惃鍘汇嬬殑涓昏鍐呭?鎬
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