【答案】C。主旨题。全文是围绕自我药疗(self-medication)展开论述的，介绍了它的历史、现状以及危害等，所以C正确。其他选项均不合题意。

A. Medical Practice

B. Clever Advertising

C. Self-Medication

D. Self-Treatment

A. the reasons for keeping medicines at home

B. people's doubt about taking drugs

C. what kind of medicine people should prepare at home

D. the possible harms self-medication may do to people

A. those good things are not without side effects

B. why clever advertising is so powerful

C. why in modern times self-medication is still practised

D. why people develop faulty ways of life

A. they often watch ads on TV

B. they are more likely to buy the drugs advertised

C. they generally lead a sedentary life

D. they don't take to sports and easily catch colds

A. suggest that self-medication has a long history

B. define what diagnosis means exactly

C. praise doctors for their expertise

D. tell the symptoms from the causes

A. ensuring harmonious relationships

B. sharing responsibility with group members

C. identifying new leaders

D. achieving a goal

A. few people qualify as “natural leaders”

B. there is no proof that “natural leaders” exist

C. “natural leaders” are easily accepted by the members of a group

D.“natural leaders” share a similar set of characteristics

A. A person who is an effective leader of a particular group may not be an effective leader in another group

B. Few people succeed in sharing a leadership role with another person

C. A person can best learn how to be an effective leader by studying research on leadership

D. Most people desire to can produce little evidence of their qualifications

A. recruitment

B. formal election process

C. specific leadership training

D. traditional cultural patterns

A. The problems faced by leaders

B. How leadership differs in small and large groups

C. How social groups determine who will lead them

D. The role of leaders in social groups