【正确答案】 C

【答案解析】[听力原文]
   M: No. 11 Police Station. Can I help you?
   W: Yes. It's about my son Leech. He went to the school this morning but hasn't been back yet and it's 6:00 p.m. now.
   M: Just a moment, please. May I have his name?
   W: Leech Smith, 112 Broadway.
   M: Thank you. Now Mrs. Smith, what is the matter exactly?
   W: Well, Leech left home at 7 o'clock this morning, but just now her teacher called me and asked why Leech didn't go to school.
   M: Do you think it's possible that he went to friend's home?
   W: I don't think so. I called her friends and our neighbors, but none of them had seen Leech today.
   M: I see. Now, Let's move to some details. How old is he?
   W: 10 years old. And he is 1.5 meters' tall.
   M: What's he wearing?
   W: A blue shirt, and white shoes, carrying a green school bag.
   M: We'll do our best to find him, Mrs. Smith. Please try not to worry.
   Where does this conversation most probably take place?
[考点] 判断对话发生的场合
根据男士说的前两句话可判断出他们是在打电话，因为公司、机构等接电话一般都是先自报名称。而且由常识可知，一般出事后会先打电话报警，而不是直接去警察局，故选C。