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 should decide on the best choice. Scientists have long been trying to find an effective way to treat drug users. However, most of the efforts have been fell flat, with treatment results not encouraging. Scientists do not give up, and continue with their researches. Until the end of last century, some new treatment methods were found. Brief Strategic Family Therapy (BSFT) is one of them. It is a brief intervention used to treat adolescent drug use that occurs with other problem behaviors. These co-occurring problem behaviors include conduct problems at home and at school. BSFT is based on three basic principles. The first is that BSFT is a family system approach. Family system means that family members are interdependent: What affects one family member affects other family members. According to family system theory, the drug-using adolescent is a family member who displays symptoms, including drug use and related co-occurring problem behaviors. These symptoms are indicative, at least in part, of what else is going on in the family system. The second BSFT principle is that the patterns of interaction in the family influence the behavior. of each family member. Patterns of interaction are defined as the sequential behaviors among family members that become habitual and repeat over time. An example: an adolescent tries to attract the attention of his/her parents when they are fighting because he/she wants to disrupt the fight. The role of the BSFT counselor is to identify the patterns of family interaction that are associated with the adolescent's behavior. problems. For example, a mother and grandmother who are arguing about establishing rules and consequences for a problem never reach an agreement because the adolescent disrupts their arguments with self-destructive attempts to get attention. Therefore, the third principle of BSFT is to plan interventions that carefully target and provide practical ways to change those patterns of interaction that are directly linked to the adolescent's drug use and other problem behaviors. The three principles seem plausible, but the therapy's effectiveness needs to be proved by more evidence. The passage mainly discusses______.