听力原文：W: Hi, Dan, you know that lab you missed？ You can have my notes.M: Thanks. I appr

听力原文：W: Hi, Dan, you know that lab you missed？ You can have my notes.

M: Thanks. I appreciate that.

W: So how are you feeling？

M: Much better now that I began taking an antibiotic. Student health gave me one, and it's really help. You know what amazes me that the human races survive before antibiotics.

W: I agree. When my father was a young boy in the 1940's, he got blood poisoning and would have died. But his doctor had heard of this new drug, called penicillin.

M: Wow, he was really lucky. And now we have lots of antibiotics that kill bacteria.

W: Well, penicillin kills bacteria, but not all antibiotics do. Some are just slowing the bacteria down until our normal immune defenses can finish the job. Tetracycline works that way.

M: Wow, you are a fund of drug trivia. How do you know all these？

W: My mother used to look up all our medicines, prescription and non-prescription. There are lots of books around. It's interesting. What antibiotic are you taking？

M: I don't remember. It's on the bottle. I think I'll take a new look at the label and drop by the library to see if they have reference books on medicines. See you in lab tomorrow.

(31)

A．Causes of illness

B．The discovery of antibiotics

C．The history of prescription drugs

D．Characteristics of antibiotics