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A. 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 computer aided courses?

F. What can help you a lot with your language learning?

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Which of the following statements is true according to the first paragraph?(  )

• A、GNP equals national income plus indirect business taxes.
• B、GNP excludes both capital consumption allowances and indirect business taxes.
• C、Personal income is regarded as the total money income received by an individual after his or her taxes are paid.
• D、The money that goes for capital consumption is not regarded as income.