【正确答案】 B

【答案解析】[听力原文]
   On the 1st of January, new regulations will come into effect which eliminate an annual leave bonus for people who put off marrying until the age of 23 for women, and 25 for men, the South China Morning Post reports. The holiday bonus was designed to encourage young people to delay getting married in line with China's one-child policy. But with that policy now being abolished, this holiday incentive is no longer necessary, the government says. In Shanghai, a young couple at a marriage registration office told the paper that they decided to register their marriage as soon as possible to take advantage of the existing policy, because an extra holiday was a big deal for them. In Beijing, one registration office had about 300 couples seeking to get married the day after the changes were announced, rather than the usual number of between 70 and 80. But one lawyer tells the paper that the changes still have to be adopted by local governments and these procedures take time. So people who are rushing to register for marriage can relax.
   What was the purpose of the annual leave bonus in China?
目的原因题。新闻中提到，1月1日新的规定将要开始执行，不再为晚婚夫妻提供年假奖励，当初制定这一政策的目的是为了配合一孩政策，鼓励年轻人晚婚。