THE 2,298-kiIometer Beijing-Guangzhou High-speed Railway 小题1:____ (official) opened to passengers on December 26，2012. It is the world’s longest high-speed rail route. The 小题2:____ (design)speed of the track is 350 km^, 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小题3:almost two thirds, from 22 hours to roughly eight hours .On December 1, 2012，not long before the opening of the Beijing-Guangzhou High-speed Railway, the Harbin-Dalian High-speed Railway, 小题4:____ first high-speed line ever to cross land that lies frozen for almost half a year, began operations, 小题5:____ allows passengers to appreciate the view off the coast from Dalian in the morning, 小题6:____ the winter snowscape of frosty Harbin in the afternoon .At present the total 小题7:__ (long) of high-speed lines in China 小题8:___(reach)9,349 km. With four main lines 小题9:___ (run) east-west and four north-south, the country’s high-speed train network is the world’s largest. China plans to expand 小题10:_ high-speed railway network to 50，000 km by 2020, to cover almost all large and medium-sized cities.