Answer: C
Answer Analysis:
The answer is C: “高铁 (gāotiě) high-speed rail”. This important rail line, connecting two of the biggest cities in the world was begun in 2008 and opened in 2011. Before the high-speed rail line was in operation, the train ride was approximately 14 hours between the two cities. After the opening, the trip was cut short to just 4.5 hours!
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