【正确答案】 B

【答案解析】[听力原文]
   M: Hi. Mary. How are you?
   W: Fine, thanks. How are things going? With the presentation, I mean.
   M: Not too bad, actually. I found that survey you sent me really useful.
   W: The one about young people and mobile phones?
   M: Yes. It shows how incredibly important mobile phones are to young people. For example, did you know that 75 percent of teenagers use their phones at least once a day?
   W: 75 percent! That's quite a lot.
   M: But actually texting is an even bigger thing with young people nowadays. About 90 percent of them send at least one text massage a day. And ff you look at the UK as a whole, people are sending over 2 billion text messages a month. What's so amazing is that they've gone from zero to 2 billion in such a short time.
   W: That's an amazing increase. You know, we could design a graph to show that.
   M: Great idea! By the way, what do you think the peak time for sending text messages is?
   W: I don't know. Seven thirty? Eight o'clock at night?
   M: Well, it is at night but apparently it's between ten thirty and eleven.
   W: That's quite late. I'm surprised.
   M: What you have to remember about mobiles is that they're part of young people's serf-expression and part of their identity. The most popular place you carry your phone is in your pocket. And the last place you should keep your phone is on your belt. That's a really big fashion mistake for most of the teenagers in the survey anyway. Now, you were going to talk about the different functions of mobile phones, Mary, weren't you? Which functions did you decide to cover?
   W: Well, the most popular, obviously, is text messaging. But you seem to have a lot of information on that already. So I will leave that to you, if that's OK.
   M: Fine, so you won't cover text messaging, but...?
   W: I think video is still a pretty specialized thing at the moment. Not that many phones have it yet. So I'm not covering that. But the other thing I'm going to look at is voicemail. It's not quite as popular with teenagers as the other functions but about two thirds still use it.
   M: OK. Let's talk about it next week.
   What do we learn from the conversation about the survey sent by the woman?
录音中男士说女士发给他的那份调查很有用，女士询问是否是那份关于年轻人和手机的调查，男士给出了肯定回答，由此可见，女士发送的报告是关于“年轻人和手机”的，B项用focuses on同义替换了录音的about，故为答案。A项与男士说的really useful相矛盾，可排除；C项错在the old，应是young men；D项错在70%，应是75%。