【答案解析】The reading passage talks about the term "cultural lag". It means it often takes quite some time for people to accept a new technological invention. The lecture gives us one example to illustrate this social phenomenon: that is, public attitude towards the invention of the telephone. It happened in 1876, when Bell displayed his telephone to the public. However, American people had many doubts towards this newfangled gadget. One of the main concerns was that they felt strange talking with someone without seeing each other. Other people claimed that it was impolite to talk to someone older or superior without seeing his face. However, as time passed, people put away their doubts and nearly the world started to use the telephone. The so-called "cultural lag", therefore, disappeared naturally. [听力原文] M: I think you have already reviewed the topic "cultural lag". It often takes sometime for the public to accept a new technology, either because they have doubt about the new invention, or have been already accustomed to the former living style. Probably no means of communication has revolutionized the daily lives of ordinary people more than the telephone. The actual history of the telephone is a subject of complex dispute. In June, 1876, Bell exhibited a telephone prototype in Philadelphia, where it attracted the attention of American people. However, the public did not accept this new product immediately and some citizens questioned the function of the novel means of communication. Although the public was so struck by this fantastic talking machine, some users felt uncomfortable to talk to somebody without seeing each other. They could not get accustomed to shouting to a machine and expecting to see the other party on the tiny machine. Other conservative people claimed it was rude to talk to the other through a metal wire, especially when talking to senior people or the superior. However, this controversy did not last long until people started to realize .the importance of this great invention. The public cannot resist the convenience brought by the telephone when making a long-distance call and calling for help in emergency situations. Not only people accepted this new communication means, the telephone has been applied in a global scale and has experienced tremendous renovations in the 20th century.