subject

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Across
  1. 2. the scientific study of the natural processes of living things
  2. 4. the study of past events
  3. 6. the scientific study of the basic characteristics（特点）of substances（物质）
  4. 8. information technology
Down
  1. 1. the scientific（科学的）study of matter and energy
  2. 3. the study of the systems and processes involved in the world's weather, mountains, seas, lakes, etc.
  3. 5. physical education
  4. 7. the study of numbers