【正确答案】 A

【答案解析】[听力原文]1-3
W: Hi, Sam, how are you feeling?
M: Horrible. I got a cold five days ago, and now it seems it's getting worse. The cough has gotten deeper, and I feel like I've been run over by a freight train!
W: Well, let me take a listen to your chest. Deep breath in... and exhale. Inhale... exhale.
M: Hear anything interesting down there?
W: It sounds like you have some congestion in your lungs. Have you been coughing stuff up?
M: A little, but not too much!
W: Well, we need to get that junk loosened up. Here is a prescription.
M: What's it for?
W: It'll help loosen your chest up and calm your cough. I want you to take it every 4 hours for a week, three pills each time, OK?
M: Fine.
W: You know that it takes time. So, don't forget to drink lots of fluids.
M: You got it. Thank you.
W: You're welcome. Take care.

根据对话，山姆主要是因为患有感冒，才有其症状：咳嗽、气闷、气急等。