1. attendant=accompanying(attendant adj.出席的, 在场的,随行的,伴随的, 附随的)
2. attest=give evidence to
3. attributed=creditedn品质，信用
4. attribution=character
5. authorized=empowered
6. autonomous=independent独立的,自治的
7. available=obtainable
8. avenue=means
9. avert=avid
B
10. baffle=puzzle困惑
11. banks=edges
12. barge=trade
13. barging=trading
14. barren=empty
15. barrier=obstacle n.(阻碍通道的)障碍物, 栅栏, 屏障)
16. barting=trading
17. basking=lying
18. be designed to=intended to
19. bears=produces
20. beckon=invite
21. beckoning=inviting
22. beneficial=advantageous
23. benefit=assistance
24. biting=sharp
25. blocked=confined
26. blurred=clouded
27. boom=expansion(boom:使迅速发展boost，成长，繁荣，暴涨，发隆隆声)
28. boost=raise(To increase; raise:增加;拔高)
29. boosts=promotes
30. boundary=border
31. boundle=group
32. break up=increasing rapidly，
33. break through=improving突破，改进
34. breed=reproduce(breed v.(使)繁殖, 教养, 抚养n.品种, 种类 )
35. brief=fleeting
36. bright=brilliant
37. brilliance=radiance光辉闪烁
38. brilliant=bright
39. brisk
40. broad=generaladj广泛的
41. broaden=enlarge
42. budding=adj.萌芽的, 发育的, 少壮的n.发芽)
43. budding=by-product的意思，
44. burgeoning=thriving
45. bustling=active
46. byproduct=unexpected词的句子
C
47. calculate计算、考虑、计划、打算、认为、以为 ( 不 是 做 计 算 讲， 选 项 忘 了)
48. caliber=quality
49. came from a article=the american army in1776, conquer pumidabledifficulties
50. camouflage=hide