B) by turning it into a solid lump
C) while keeping its structure unchanged
D) while retaining its liquid form
Unit 2
21. B 22. A 23. B 24.D 25. C
26. A 27. C 28. C 29.A 30. B
31. D 32. B 33.C 34. D 35. A
36. A 37. B 38. D 39.C 40. D
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