Question 13 is based on the passage you have just heard.

Passage 2

听力原文

    In 2014, one in 16 Americans visited the hospital emergency room for home injuries. One of the main causes of these accidents? A wandering mind! (12) By one estimate, people daydream through nearly half of their waking hours.

    Psychologists have recently focused on the tendency to think about something other than the task one is doing. For one experiment, (13) researchers developed an app to analyze the relationship between daydreaming and happiness. They found that the average person’s mind wandered most frequently, about 65% of the time, during personal activities, such as brushing their teeth and combing their hair. Respondents’ minds tended to wander more when they felt upset rather than happy. They were more likely to wander toward pleasant topics than unpleasant ones.

    How do daydreams affect daydreamers? A wandering mind leaves us vulnerable when driving. In one study, researchers interview 955 people involved in traffic accidents. The majority of them reported having daydream just before the accident. Yet other research suggests that daydreaming has benefits. (14) Researchers have found that it gives us a chance to think about our goals and it also seems to increase creativity. In one experiment, 145 undergraduates completed four “unusual uses” tasks, each requiring them to list as many uses as possible for an everyday object. After the first pair of tasks was completed, one group of participants was assigned an undemanding activity intended to cause their minds to wander. (15) When all the participants proceeded to the second pair of tasks, the daydreamers performed 40% better than the others.

13. For what purpose did the researchers develop the new app?

解析：A。录音中明确表示，在一项实验中，研究人员开发了一个软件，用来分析白日梦与幸福感之间的关系，故A项正确。B、C项在录音中均未提到，故排除。音频中说的是白日梦和幸福感之间的关系，并非和健康的关系，故排除D项。