Question 4 is based on the news report you have just heard.

​​​​​​​听力原文

    (3) [Almost half the center of Paris will be accessible only by foot or bicycle this Sunday to mark World Car-Free Day.] (4)[ This is in response to rising air pollution that made Paris the most polluted city in the world for a brief time. ]Mayor Anne Hidalgo promoted the first World Car-Free Day last year. Hidalgo also has supported a Paris Breathes Day. On the first Sunday of every month, Paris clears traffic from eight lanes of the main road. About 400 miles of streets will be closed to cars. It is expected to bring significant reduction in pollution levels. “Last year’s Car-Free Day showed a 40% drop in pollution levels in some parts of the city, according to an independent air pollution monitor,” reports The Guardian, “and sound levels dropped by 50% in the city center.”

4. What motivated the mayor of Paris to promote the first World Car-Free Day in her city?

解析：A。录音前半部分说到，为了纪念“世界无车日”，巴黎市中心近一半的地区只允许步行或骑自行车前往。这是为了应对日益严重的空气污染问题，空气污染使巴黎一度成为了世界上污染最严重的城市。巴黎市长安妮·伊达尔戈在去年首次推行了“世界无车日”。由此可知，是巴黎日益严重的空气污染促使市长开始推行“世界无车日”。A项表述与录音一致，其中rising air pollution和Paris都是原词复现，故正确答案为A。

错项排除：B、C两项中的global warming和cost of petrol在录音中都未提及，故排除。录音中虽然说到巴黎市长推行世界无车日以减少汽车通行量，但这并不是因为交通噪音，而是因为空气污染加剧，D项中的traffic noise是利用录音中出现的sound设置干扰，但录音中说的是“无车日”的噪音污染减少了50%，这是推行“无车日”带来的结果，并非是因为噪音而推行的“无车日”，故D项错误。