2. 外语
  3. Questions 1-6 Choose the appropriate letters A-D and write them in boxes 1-6 on your answer sheet. *

Questions 1-6 Choose the appropriate letters A-D and write them in boxes 1-6 on your answer sheet. *

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问题 Questions 1-6
Choose the appropriate letters A-D and write them in boxes 1-6 on your answer sheet.

*
选项
答案I
解析 Para 9: Overcrowded classrooms whose ventilation systems were designed for smaller numbers of children frequently contain levels of carbon dioxide that would be regarded as unacceptable on board a submarine.
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