BEC中级词汇：UNIT 2 Letters，Faxes and Memos
BEC中级词汇：UNIT 4 Summaries,Notes,Reports
BEC中级词汇：UNIT 5 Working Together
BEC中级词汇：UNIT 6 International Trade
BEC中级词汇：UNIT 8 Dealing with Problems
BEC中级词汇：UNIT 9 Visitors and Travellers
BEC中级词汇：UNIT 12 Processes and Operations
BEC中级词汇：UNIT 13 Jobs And Careers
BEC中级词汇：UNIT 14 Sales and Negotiation
BEC中级词汇：UNIT 15 A Special Project
