Unit 1 Text A-Nouns

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Across
  1. 2. （para.1）a ~ case:一个典型案例
  2. 7. roads, bridges, banks...
Down
  1. 1. [pə'ræmɪtər]
  2. 3. 猜想、假设
  3. 4. residents
  4. 5. a system for moving people from place to place
  5. 6. (para.10) barrier