Part I
1. C 2. D 3. B 4. C 5. D
6. A 7. C 8. B 9. B 10. A
11. B 12. C 13. B 14. D 15. A
16. D 17. A 18. C 19. B 20. A
Part II
21. D 22. B 23. C 24. D 25. A
26. A 27. D 28. B 29. C 30. C
31. A 32. C 33. B 34. C 35. D
36. A 37. C 38. B 39. D 40. B
Part III
41. A 42. D 43. C 44. D 45. B
46. C 47. A 48. D 49. B 50. A
51. C 52. A 53. D 54. C 55. B
56. D 57. B 58. B 59. C 60. A
61. D 62. A 63. D 64. B 65. A
66. C 67. D 68. B 69. A 70. C
Part IV
S1. master → mastering
S2. that → what
S3. in an effect → 去掉an
S4. lazy → laziness
S5. which → that
S6. affecting → affected
S7. at same time → same前加the
S8. year → years
S9. relative → relatively
S10. with → without