B、the difference between national income and personal income
C、the concept of income
D、the difference between disposable income and nondisposable income
16. Paragraph➊17. Paragraph❷18. Paragraph❸19. Paragraph❹20. Paragraph❺A. What is the function of audio courses?B. What is the function of flash cards?C. What is the function of traditional courses?D. What are the most useful tools for language learning?E. What is the function of computeraided courses?F. What can help you a lot with your language learning?
21. The materials and tools available to help you with your language studies range.22. The appropriate use of these materials and courses will enable youto learn language.23. Larger dictionaries will provide the learners with.24. The traditional courses are designed for.25. With audio courses , you can learn.A. more definitions, examples of usage, and information aboutpronunciation, and grammarB. authentic pronunciation and a manageable amount of vocabularyC. phrasebooks, dictionaries, videos, games and provide onlineand/ or telephone supportD. from dictionaries to language coursesE. in a much easier and more effective wayF. beginners or people with only a little knowledge of the language