四级听力长对话短文怎么练啊 谢谢大家答:常用的词汇和词组:required, compulsory, elective, selective, optional, course, description, catalog, bulletin, prerequisite course(预修课程), preliminary course(预备课程), such a heavy load, excellent reputation, drop a course(退修课程)等。(3)补课场景场景人物:同学之间补课。场景涉及的内容:通常是某...