Context: Nanjing is the transportation hub in eastern China and the downstream Yangtze River area. Different means of transportation constitute a three-dimensional transport system that includes land, water and air. As in most other Chinese cities, public transportation is the dominant mode of travel of the majority of the citizens. As of October 2014, Nanjing had five bridges and two tunnels over the Yangtze River, which are tying districts north of the river with the city centre on the south bank.

Question: What are the three types of transport in Nanjing?
Answer: land, water and air

Question: What is the most popular method of travel for citizens?
Answer: public transportation

Question: How many bridges does Nanjing have over the Yangtze River?
Answer: five

Question: How many tunnels does Nanjing have over the Yangtze River?
Answer: two

Question: Where is the city centre located?
Answer: on the south bank