答案：
1. C 2. B 3. C 4. B 5. D
6. B 7. B 8. C 9. B 10. A 11. B12. B 13. C 14. C 15. B 16. B 17. A 18. D 19. C 20. B
21. A 22. D 23. C 24. A 25. D 26. C 27. D 28. A 29. D 30. B 31. B 32. A 33. A 34. B 35. B 36. A 37. A 38. C 39. C 40. D
41. C 42. A 43. C 44. B 45. B 46. D 47. A 48. A 49. D 50. C 51. C 52. D 53. C 54. B 55. B 56. A 57. D 58. A 59. C 60. A
61-65 CBADC 66-70 BDABB 71-75 AABBD 76-80 CACDA
86. We are going to place large orders with you if you reduce your price by 5%. 87. Kids like parents whose words are in accordance with their deeds.
88. Through social practice we can learn a lot which can not be got from books. 89. It is reported that the U.S. President will visit China next February. 90. -- Can I take your book home and return it to you tomorrow?-- Ok.