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1. Listening Comprehension
1~4) Listen to the following and answer the question.
1) Who developed hashcash, a proof-of-work scheme for spam control?
2) What were the first proposals for distributed digital scarcity-based cryptocurrencies?
3) What vulnerability did Nick Szabos bit gold proposal face according to the passage?
4) What did Frank read in the New York Times?
2. Grammar
1) In the following examples, which example is used differently regarding the use of it?
2) Which words are appropriate in parentheses in the following sentence?
3) Which word is most appropriate in p