In 1990,22-year-old Christopher McCandless gave up his career plans，left behind everyone he knew，donated all his savings to charity，and went off on an adventure，hiking his way through America to Alaska．
Of course,this is an unusual story most college graduates would not do so. However，studies show that in teenage years, people are more likely to try out new experiences.For example，instead of working his way up the same organization like his grandfather did，a 15-year-old may dream about becoming a traveller一only to find in his early 20s that this attraction of new places is fading and change is less attractive．
The reason why people become less keen to change as they get older may be that people
generally have similar life patterns and demands．Most people aim to find a job and a partner. As they get older，they may have young children and elderly family members to look after. These responsibilities cannot be achieved without some degree of steadiness，which means that new experiences and ideas may not have a place in the person’s life．New experiences may bring excitement as well as insecurity,and so most people prefer to stay with the familiar.
However，not every individual is the same. A child may want to play a different game every day and get fed up if nothing changes at the kindergarten．Another may play with the same children and toys on every visit. Young children who avoid new experiences will grow up to be more traditional than others. Psychologist argue that those who have more open personalities as children are more open than others might be when they are older and that young men have a greater interest in novelty than women，although as they age，this desire for new experiences fades more quickly than it does in women．
【1】 The first paragraph serves as a(n） ．
A. introduction B．explanation
C. comment D. background
【2】What does the author think is the key factor that prevents people trying out new experiences?（ ）
A. Age B. Partner
C. Responsibility D. Education
【3】The underlined phrase“interest in novelty”most probably means ．
A. independence B. curiosity
C. security D.excitement
【4】According to the passage, we can infer that_______.
A. a child who likes different games may not like to change after growing up
B. a teenager is not interested in a new start before graduation
C. women are more likely to try new things than men of the same age
D. as one gets older, he prefers the old patterns of life