B
1. The London tube has 270 stations.
2. The most expensive means of transport to use is a helicopter.
3. The cheapest to use is a bus.
4. Taxis are yellow in the New York City.
5. Trams in the past were pulled around the city by the horses.
6. Three billion passengers use the Moscow Metro a year.
7. The fastest way to travel around the city is by a helicopter.
