【单选题】

Questions 18 to 20 are based on the following passage.At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.

What is the main topic of this talkA．Television’s effect on the movie industry.
B．The relationships between different mediA、
C．Radio news as a substitute for newspapers.
D．The role of the print medi