A、From books. B、In the library. C、From teachers. D、On TV. A

W: Hi, Rob, you know that class you missed yesterday?
M: Yes, but I was seriously iii.
W: I’m sorry to hear that.  You (:an have my notes.
M: Thanks.  I appreciate that.
W: So how are you feeling?
M: Much better now that I began taking an antibiotic. Doctor Lee gave me one, and it really helps. You know what amazes me is that how the human beings managed to 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.
M: Wow! How do you know all these?
W: My mother used to look up all our medicines. There are lots of books around. It’s interesting.  What antibiotics 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 the lab tomorrow.