What is distance learning It means that you study on your own, at home or wherever suits you. Recently, the world famous Open University in the United Kingdom has designed a new style of distance learning, which is called (1) . The phrase "Open Learning" means you study (2) . You read course material, work on course activities, and write (3) . The word "Supported" means you have help (4) , the student services staff at regional centres, and centralized areas such as (5) . You can also contact other students through tutorials and (6) , the University’s online conferencing system, and events and clubs organized by (7) . Most distance learning courses use printed paper materials. They also include some (8) materials such as a CD, DVD or video. Many courses have a web site and an (9) . You’ll need access to a computer (10) to make use of these. The Open University can help its students buy a computer and (11) the cost of accessing the Internet.
With most distance learning courses, no (12) are required to study. of course, you have to be aged 18 when your course starts but there is no (13) . Currently the Open University has around (14) undergraduate and more than 30,000 postgraduate students, of which 10,000 have (15) . Nearly all students are studying (16) . About 70 per cent of undergraduate students are in (17) . More than 50,000 students (18) by their employers for their studies. Most distance learning courses (19) . Some of them are even available in other parts of the world. With over 25,000 of its students living outside the UK, the Open University is the (20) that offers distance learning throughout the world.
13（）
参考答案：upper age limit
解析：
[听力原文]1-20 What is distance learning It means that you study on your own, at home or wherever suit you. Recently the world-famous Open University in the United Kingdom has designed a new style of distance learning which is called "Supported Open Learning" (1). The phrase "Open Learning" means you study in your own time (2), you read course material, work on course activities and write assignments (3). The word "Supported" means you have help from a tutor (4), the student service staff at regional centers and centralized areas such as the University’s library (5). You can also contact other students through tutorials and informal study groups (6), the University’s online conferencing system and events and clubs organized by the Student Union (7). Most distance learning courses use printed paper materials. They also include some interactive (8) materials such as a CD, DVD or video. Many courses have a website and an online computer conference (9). You’ll need access to a computer with Internet (10) to make use of these. The Open University can help its students buy a computer and pay for (11) the cost of accessing the Internet. With most distance learning courses, no previous qualifications (12) are required to study. of course, you have to be aged 18 when your course starts, but there is no upper age limit (13). Currently the Open University has around 150,000 (14) undergraduate and more than 30,000 postgraduate students, of which 10,000 have disabilities (15). Nearly all students are studying part-time (16), about 70 percent of undergraduate students are’ in full-time employment (17). More than 50,000 students are sponsored (18) by their employers for their studies. Most distance learning courses are available throughout Europe (19). Some of them are even available in other parts of the world. With over 25,000 of its students living outside the UK, the open university is the only international institution (20) that offers distance learning throughout the world.