第一组 1. liquid 2. expand 3. contract 4. substance 5. mixture 6. oxygen 7. electricity 8. stage 9. conclusion 10. aim 第二组 11. reaction 12. electrical 13. equipment 14. react 15. potassium 16. sodium 17. calcium 18. magnesium 19. aluminium 20. zinc 第三组 21. partial 22. copper 23. oxide 24. rust 25. boil 26. ordinary 27. steam 28. float 29. form 30. dissolve 第四组 31. balance 32. crucible 33. tongs 34. flame 35. facility 36. lecture 37. department 38. astonished
短语
1. add ... to
2. used to
3. in the area of
4. be proud of
5. be supposed to
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