Question 12 is based on the passage you have just heard.

Passage Two

听力原文

    There is something about water that makes it a good metaphor for life. That may be one reason why so many people find relief in swimming when life’s seas get rough. (12) And it goes some way towards explaining why books about swimming, in which people tackle icy lakes, race in rivers, and overcome oceans while reflecting on their lives, have recently become so popular. These books reflect a trend, particularly strong in Britain, where swimming in pools is declining, but more and more folks are opting for open water. “Wild swimming” seems to be especially popular among women. (13) Jenny Landreth recently published a guide to the best swimming spots in London.

    Her new book, Swell, interweaves her own story with the history of female pioneers, who accomplished remarkable feats and paved the way for future generations. (14) Notions of modesty restricted women in the Victorian era, but they still swam. A “bathing machine” was rolled down to the seashore so women would not be seen in swimwear. (14) In 1892 The Gentlewoman’s Book of Sport described a woman swimming in a heavy dress, boots, hat, gloves, and carrying an umbrella. Eventually, swimming became freer. Mixed bathing was permitted on British beaches in 1901. Women won the right to swim in public pools, learned to swim properly, created appropriate swimwear, and in time, even competed against men.

    (15) The first woman to cross the English Channel was Gertrude Ederle. In 1926, she beat the record by almost two hours and her father rewarded her with a red sports car.

12. What has become so popular recently?

解析：D。录音开头说到，这也间接解释了为什么最近关于游泳的书备受欢迎。D选项Books about swimming原词复现，因此D项正确。B项“在河里比赛”是游泳书籍中的部分描写，以偏概全，故排除。C项内容出现在录音后半段，同样也只是另一本游泳书籍中的内容，故排除。