单项选择题
What causes people to join groups? One reason is for security, a factor that leads people to form neighborhood-watch groups. Another common reason for joining a group is a desire to be with others who share one’s interests and values. Some people, for instance, join computer support groups to share ideas, knowledge, and software. Managers may join service groups, such as Rotary Clubs, to exchange ideas with other managers. Individuals may also form groups to acquire power that is difficult if not impossible to attain alone. Membership in a union or employee association, for example, provides workers with influences that they lack as individual employees. Goal accomplishment is a final reason people join groups. 9Mountain climbers and astronauts generally function in groups.
A、cause and effect
B、comparison and contrast
C、definition
D、classification and division
A.