【单选题】Section B Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You shoul...
A.
how scientists are trying to find an effective treatment for drug users
B.
how doctors and hospitals should help drug users to quit drugs
C.
how a new kind of therapy is developed by scientists