In today's lecture, we'll discuss the history of urban transportation. Initially, horse-drawn carriages dominated city streets in the 19th century. However, with the invention of the electric tram in the 1880s, cities began to shift towards more efficient public transit. By the 1920s, buses powered by internal combustion engines started to replace trams in many areas because they were cheaper to operate and more flexible in routing. Nevertheless, trams remained popular in some European cities due to their capacity and lower pollution. Today, many cities are reintroducing trams as part of sustainable transport plans, despite initial high infrastructure costs.
❓ 根据讲座内容，为什么在20世纪20年代公交车开始取代有轨电车？
A. A. 公交车对乘客来说更加舒适。
B. B. 公交车运营成本更低，且路线灵活性更强。
C. C. 有轨电车过于缓慢且不可靠。
D. D. 公众出于环保原因更青睐公交车。
✅ 正确答案
B. Buses had lower operating costs and greater route flexibility.