【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. What does the speaker focus on? 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。

【正确答案】 C

【答案解析】[听力原文] Instead of learning job skills or finishing their education, what do some American adults attend continuing education programs for? 文章提到一些成人学生上课并不是要完成他们的教育或学习工作技能，而是想发展新的兴趣爱好，故本题选C。

【正确答案】 B

【答案解析】[听力原文] What is the main reason for the popularity of adult education? 文章最后一段提到，“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。”故B项正确。