Online distance learning is an instructional system which connec

Online distance learning is an instructional system which connects learners with educational resources．Students work on their own at home,at work,or at school and communicate with faculty and other students by means of e-mail,electronic meetings,videoconferencing,chat rooms,instant messaging and other forms of computer-based communication．There are both advantages and disadvantages to online distance learning. There are many benefits to using online distance learning environments．Online education is available all the time,anywhere and to all people．However,there are weaknesses for some learners．The online learner only has the written text and no other face-to-face hints．This may confuse the learner and cause misunderstanding．While distance learning allows for an openness,it is also difficult because it is done by e-mail messages and writing,and therefore may take more time than face-to-face learning．Sometimes the messages can be overwhelming for many online students. Universities,colleges and schools use online distance learning environments．These are important for students who may be unable to attend classes for various reasons like illnesses or busy everyday schedules．Some learners just want to further their studies at home．They enjoy the convenience of home learning as they take regular programs or enrichment classes. Online courses keep learners very occupied at all hours of the day．There are a great many messages and other online resources to read and respond to．Most learners have regular jobs or attend regular school classes on ground as well．However,the benefits are clear．Online distance learning is becoming very popular．Some online classes have become a profitable business as they replace regular traditional means of learning. Which of the following is TRUE of the passage about online distance learning?
A、It has more disadvantages than advantage
B、It is a learning form based on interne
C、It is not available for some student
D、It has only enrichment classe
【正确答案】：B
【题目解析】：文章主要描述了在线远程学习的定义、特点、优势与劣势以及它的应用。我们来逐一分析选项： A. It has more disadvantages than advantage（它的劣势多于优势） - 文章明确指出在线远程学习既有优势也有劣势，但没有比较二者谁多谁少，因此A选项不正确。 B. It is a learning form based on interne（它是一种基于互联网的学习形式） - 文章开头就提到“Online distance learning is an instructional system which connects learners with educational resources”，这明确说明了在线远程学习是通过互联网连接学习者和教育资源的，因此B选项正确。 C. It is not available for some student（它不适用于某些学生） - 文章提到在线远程学习对于因各种原因（如疾病或繁忙的日常安排）无法参加课堂学习的学生来说是很重要的，因此C选项的说法与文章内容相悖。 D. It has only enrichment classe（它只有进修课程） - 文章提到在线课程包括常规课程和进修课程，并没有说只有进修课程，因此D选项不正确。 综上所述，正确答案是B，即在线远程学习是一种基于互联网的学习形式。