For many， music is as important to the human experience as eating and breathing． We hear music everywhere-at home， the gym， parties and stores． But what kind of music do we prefer to listen to， and when and why do our musical preferences change？
The relationship between the change of seasons and musical preferences was the focus of a study led by Psychologist Terry Pettijohn． He and his team based their research on a previous study that examined the relationship between popular music preferences and the Environmental Security Hypothesis （假设）． The results showed that over time， when social and financial conditions were more risky， the songs of the year that were slower， longer， more comforting and serious were most popular． And during periods in which social and financial conditions were generally stable， the result is opposite．
Building on these findings， Pettijohn and his team wondered if the Hypothesis could also be applied to the change of seasons． For college students， the participants in this study， autumn begins at the start of the academic school year． Gone are the carefree days of summer， when school is out． Winter means colder temperatures， shorter days， and， in many places in the country， snow． Spring， however， is a different story． It represents a fresh start and when clocks spring（跳跃） forward， we gain an extra hour of daylight． As students walk into summer， they're absorbed in the sunshine and social activity-and enjoy a break from school．
But do changing seasonal conditions influence musical preferences？ To answer this question， the researchers designed two studies． What did they find？ Both groups of college students favored more serious music during the seasons of fall and winter， and more active and energetic music during the spring and summer seasons． And these findings， Pettijohn believes， have practical significance．



The purpose of the question raised in Paragraph 1 is to ______ ．

A. present a different opinion on music
B. prove where to listen to music matters
C. introduce the topic on musical preferences
D. stress the importance of music to humans

What influences a person's choice of music types according to the previous study？ ______

A. Whether one has enough free time．
B. Whether one lives in a stable situation．
C. Whether one is exposed to sunlight．
D. Whether one chooses to change his life．

How does Pettijohn feel about the findings of his studies？ ______

A. It's unexpected
B. It's significant．
C. It's humorous．
D. It's discouraging．