单项选择题
In Sections A, B and C you will hear everything once only. Listen carefully and then answer the questions that follow.SECTION A TALK Questions 1 to 5 refer to the talk in this section. At the end of the talk you will be given 15 seconds to answer each of the following five questions. Now listen to the talk.
According to the passage, during the 18th and 19th centuries cities were small in size mainly because() A.the urban pupulation was stable.
B.few people lived in cities.
C.transport was backward.
D.it was originally planned.