THE 2,298-kiIometer Beijing-Guangzhou High-speed Railway 16_____ (official) opened to passengers on December 26，2017. It is the world’s longest high-speed rail route. The 17_____ (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 18 almost two thirds, from 22 hours to roughly eight hours .On December 1, 2017，not long before the opening of the Beijing-Guangzhou High-speed Railway, the Harbin-Dalian High-speed Railway, 19_____ first high-speed line ever to cross land that lies frozen for almost half a year, began operations, 20_____ allows passengers to appreciate the view off the coast from Dalian in the morning, 21_____ the winter snowscape of frosty Harbin in the afternoon .At present the total 22_____ (long) of high-speed lines in China 23_____(reach)9,349 km. With four main lines 24_____ (run) east-west and four north-south, the country’s high-speed train network is the world’s largest. China plans to expand 25_____ high-speed railway network to 50，000 km by 2020, to cover almost all large and medium-sized cities.

　　【参考答案】语法填空：

　　16. officially

　　17. designed

　　18. by

　　19. the

　　20. which

　　21. and

　　22.length

　　23. has reached

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