【单选题】听力原文: Good morning, everybody. Now last week we were looking at the positive effects that computers have had on our society. This week I'd like to talk about one of the negatives, computer viruses. OK...
A.
What computer viruses are and how to fight against them.
B.
The history of computer viruses and how to make them.
C.
The negative effects brought by computer science.
D.
How computer viruses work and how they are developed.