【简答题】A subway is not just an important form of transport. It is also a window for other people to learn about local cultures. Beijing, China The Beijing Subway was opened in 1969 and is the oldest subway s...
【单选题】For the subway is an enduring _________ of mass-transit engineering: tains make 6,800 trips each day over 731 miles of rail, carrying 3.7 million people.