The2,298-kilometerBeijing-GuangzhouHigh-speedRailway

问题详情：

The 2,298-kilometer Beijing-Guangzhou High-speed Railway ___41___ (official) opened to passengers on December 26，2012. It is the world’s longest high-speed rail route. The ___42___ (design)speed of the track is 350 kilometers, though speeds during the initial period of operation will be limited to about 300 km/h. The new route cuts the travel time between Beijing and Guangzhou ____43____almost two thirds, from 22 hours to roughly 8 hours December 1, 2012，not long before the opening of the Beijing-Guangzhou High-speed Railway, the Harbin-Dalian High-speed Railway, ___44___ first high-speed line ever to cross land that lies frozen for almost half a year, began operations, ___45___ allows passengers to appreciate the view off the coast from Dalian in the morning, ___46___ the winter snowscape of frosty Harbin in the afternoon . At present the total ___47___ (long) of high-speed lines in China ___48___(reach) 9,349 km. With four main lines ___49___ (run) east-west and four north-south, the country’s high-speed train network is the world’s largest. China plans to expand ___50___ high-speed railway network to 50,000 km by 2020, to cover almost all large and medium-sized cities.

【回答】

41. officially   

42. designed   

43. by    44. the   

45. which    46. and   

47. length    48. has reached   

49. running   

50. its

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