包邮商务英语教师用书-第二册-(第二版)

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《商务英语:教师用书(第2册)(第2版)》：新世界商务英语系列教材，商务英语综合教程子系列

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插图：Suggested answerInterpersonal relationships are dynamic systems that change continuously during their existence. Like living organisms, relationships have a beginning, a lifespan, and an end. They tend to grow and improve gradually, as people get to know each other and become closer emotionally, or they gradually deteriorate as people drift apart and form new relationships with others.One of the most influential models of relationship development was proposed by psychologist, George Levinger. According to the model, the natural development of a relationship follows five stages.