Question 17 is based on the passage you have just heard.

Passage One

    There’s one sound that gets a big reaction from kids on a hot day, （16）the sound of an ice-cream truck. Maria McCartney has been in the mobile ice-cream business since 2005. “When I was a little girl, I saw an ice-cream truck and knew I wanted to have one someday,” McCartney said. During the hot days of summer, Maria and her daughter drive an ice-cream truck through neighborhoods and parks in Billings. It’s not about making money for this former elementary school teacher. Rather, she wants to（17）preserve the tradition of the neighborhood ice-cream truck. “Truly my favorite part is to see the kids jumping up and down and they just get so excited. It’s great to build a memory for them too. There’s not a lot of these ice-cream trucks around anymore. The parents come out barefoot and screaming, ready to buy ice-cream; they remember when they were kids and they saw a truck,” she said. While the treats may be ice cold, Maria has a warm heart for little faces. Her truck features a donation bucket（18）for kids who don’t have money for ice-cream. “When there are three kids and only two of them have money, I always make sure the third one gets something because I can’t drive away and have that third one not have something,” she said.

17. Why does Maria go into the mobile ice-cream business?

解析：A。该题目为细节题。问题是：为什么Maria进入了移动冰激凌商业领域？根据选项关键词“money”和“tradition”可以定位原文出处，也可以通过转折处“rather ”预测问题出处。所以根据原文“It’s not about making money for this former elementary school teacher. Rather, she wants to preserve the tradition of the neighborhood ice-cream truck”，她这样做不是为了赚钱，而是为了延续社区冰激凌车传统。选项A）To preserve a tradition，与原文信息完全一致，再现原文。因此，此题目正确答案为A。