【正确答案】 D

【答案解析】[听力原文]
   Millions of Americans take part in adult education programs. Some adults are completing high school, college or graduate school work. They attend classes designed especially for working people on weekends or at night. Other adults take classes by mail or on their computers. For example, the University of Arizona Extended University is one of many colleges now providing such courses.
   Other adults learn job skills like computer science or wood-working. Still other adult students learn to read or improve their English.
   Some adult students are not trying to finish their education or learn job skills. Instead, they want to explore new interests. They want to learn to speak a foreign language, play a musical instrument or take good pictures. They attend continuing education programs at a community college or public school. For example, Montgomery College in Rockville, Maryland, offers many classes. They teach adults how to build a house or how to write their memories.
   An agency in the federal government's Department of Education supervises public adult education programs. The Departments of Agriculture and Defense offer many subjects for adults. So do private companies, labor unions and organizations. These subjects include the arts, science and business.
   Education experts say the large number of retired Americans are a major reason for the popularity of adult education. These people say they want to continue developing their brains.
   Q: What does the speaker focus on?
数以百万计的美国人参加了成人教育课程。一些成人即将完成高中生、大学生或研究生课程。他们在周末或者晚上参加专门为上班的人开设的课程。另外一些成人则学习函授课程或者网络教育课程。例如，美国亚利桑那大学拓展教育学院就是目前提供这种学习课程众多大学中的一所。
   另外一些成人学习计算机或木材加工等工作技能。还有一些成人学生则学习阅读技巧或提升英文水平。
   有些成人学生并非是为了完成教育历程或学习工作技能，相反，他们只是想发展新的兴趣爱好。他们想学习说一门外语，演奏一种乐器或者提高照相技术。他们在社区学院或者公立学校参加继续教育课程。例如，马里兰州罗克维尔市的蒙哥马利学院就提供了很多相关课程。他们教成人如何建造房屋，如何把经历过的事情诉诸笔端。
   美国联邦政府教育部专门有一个机构监管公共成人教育课程。美国农业部和国防部为成人提供了许多学习科目。许多私人企业及工会组织也参与其中。这些学习科目包含文科、理科或商务等方面。
   教育专家称，美国有大量退休人员，这是成人教育课程流行起来的一个主要原因。这些退休人员表示他们希望继续增长才智。
   根据选项中出现的classes，employees，learning和education可以判断短文讨论的内容与学习和教育有关，而且很有可能是与成人教育相关。
   ①四个选项均为名词性短语。
   ②两项与教育有关(classes，education programs)。
   结论：本题可能考查这篇文章主要关注的是什么问题，很有可能与教育有关。
   文章一开始就提到，美国有数以百万人参加了成人教育课程，下文围绕这一主题进一步展开，讲述了美国成人教育课程设置的特点、高校和政府对于成人教育的扶持以及美国成年人参加成人教育课程的原因等方面，故可知本题应选D。