4．The purpose of the text is to ________.

　　A．introduce how to show yourself in college

　　B．tell college students how to socialize with others

　　C．give college students some advice on self­growth

　　D．explain the importance of four­year college life

　　答案　C

　　解析　写作目的题。根据第一段“If you wish to make the most of your campus experience and become a better person after those four years...”和文中多处出现的self growth，还有交朋友、调节想家的心情、参加俱乐部或组织、尊重教授、积极上课这五个方面的内容，可推断文章旨在给出大学期间自我发展的建议，故选C项。

　　B

　　How is it that siblings(兄弟姐妹) can turn out so differently？One answer is that in fact each sibling grows up in_a_different_family.The firstborn is，for a while，an only child，and therefore has a completely different experience of the parents than those born later.The next child is，for a while，the youngest，until the situation is changed by a new arrival.The mother and father themselves are changing and growing up too.One sibling might live in a stable and close family in the first few years；another might be raised in a family crisis，with a disappointed mother or an angry father.

　　Sibling competition was identified as an important shaping force as early as in 1918.But more recently，researchers have found many ways in which brothers and sisters are a lasting force in each others’ lives.Dr.Annette Henderson says firstborn children pick up vocabulary more quickly than their siblings.The reason for this might be that the later children aren’t getting the same one­on­one time with parents.But that doesn’t mean that the younger children have problems with language development.Later­borns don’t enjoy that much talking time with parents，but instead they harvest lessons from bigger brothers and sisters，learning entire phrases and getting an understanding of social concepts such as the difference between “I” and “me”．

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