28. acoustics n. 音响效果
The performance was slightly marred by the hall’s poor (由于大厅音响效果不尽人意，演出因此稍受影响。)

29. acquit vt. 宣告……无罪；无罪释放
He was acquitted of the charges.(指控不成立，他被无罪释放。)

30. acrobatic a. 杂技（表演）的
It was a rare experience to attend a show at once so innocent, so charming, so skilled, and so fresh, as that given at the Shanghai Acrobatic Tester.（既天真无邪又妩媚动人，既技艺绝伦有活泼新颖，能在上海杂技场看上这样一场表演，的确是人生一次难得的经历。）

31. acrobatics n. 杂技

32. across-the board wage increase 全面增长工资

33. acting president 代总统

34. action platform 行动纲领

35. action policy 行动方针；实施方针

36. active capital 流动资本

37. active substance 放射性物质

38. active trade balance 贸易顺差

39. activist n. 活动家；活跃分子

40. add vt. (1).增加；增添
One of the best ways farmers can make their land richer is to add nitrogen to the soil.（农民们能够使他们的土地肥沃的最好办法之一，就是在土壤中加施氮肥。）
(2).接着说；补充说；又说
China has been relentless in its pursuit of economic reforms, and has adopted an earnest and down-to-the earth attitude in its WTO negotiations, the Chinese delegate added.(中国代表补充说，中国一直在坚持不懈地进行经济改革，并在世界贸易组织谈判中持认真务实的态度。)

41. administration party 执政党

42. administrative a. 行政的；执政的

43. admit vt. (1).承认
Later, the foreign minister may admit what he had said on TV was wrong. (稍后，这位为外交部长可能会就其电视讲话的内容承认他是错的。)
(2)．许可
last week both the north and south Koreas were admitted into the Untied Nations.（上周，南北朝鲜被获准加入联合国。）

45. admit the best examinee 择优录取

46. adopt vt. 采用；选定；正式通过

47. adult education 承认教育

48. advance booking office 预售票初

49. advance country 发达国家

50.advanced production worker 先进生产者