A、Giving him or her a cigarette. B、Talking with him or her. C、Investigating him or her in advance. D、Letting him or her to chat

What is the best way to catch someone who is telling a lie? For a long time, the traditional method of identifying liars was to watch their body language, including facial expressions. What if the person appears to be nervous? What about other nervous movements, such as shifting from side to side? Many people depend on this method. But does a person’s body and face reveal the truth? Not according to a new study.
   Talking, it seems, is the best way to smoke out a liar. That is what researchers in the United Kingdom found out recently. Their investigation took place at one place where lying can get you into big trouble—an airport. The researchers asked volunteers to pretend they were real passengers and then lie to airport security agents. Some of the agents used spoken conversation-based methods to question these make-believe passengers. Others depended instead on the person’s body language, like lack of eye contact and showing signs of nervousness. The agents talking with the passengers were 20 times more likely to catch the liars. The British government partly financed this study. The American Psychological Association published the findings. The study found that these conversation-based techniques can help you recognize when a person is lying to you. However, using body language and facial expressions to catch someone in a lie is really hard. And it only works, seemingly, by chance.
   Thomas Ormerod is the head of the School of Psychology at the University of Sussex in England. In an article on the APA website, he says that for actual passengers, they are "just chatting about themselves. It shouldn’t feel like an interrogation. "
Questions 9 to 11 are based on the passage you have just heard.
9. What is the traditional way of catching someone who is lying?
10. What is the best way to search out a liar according to the researchers in the UK?
11. What does the speaker say about identifying liars?