1. enclosure=surrounding(enclosure n.围住, 围栏, 四周有篱笆或围墙的场地)
2. encompass=include高频 v包含某东西
3. encouraged=promoted.v鼓励，促进，发扬
4. encroachment=invasion
5. encyclope encyclopaedia
6. endangered=abundant(反义词，句中选)
7. endorse
8. endue=follow
9. endure=persevere
10. enduring=lasting
11. energetic=vigorous精力旺盛的
12. engage=involve
13. enhance=improve
14. enhance=rising( 文中找)
15. enhance=improve
16. enormous.凶暴的，巨大的
17. enrich=enhance(Enrich vt.使富足, 使肥沃, 装饰, 加料于, 浓缩)
18. ensue=follow
19. entail=involve entail: vt.使必需, 使蒙受, 使承担, 遗传给
20. enter=go into
21. entire=adj.全部的, 完整的, 整个)
22. entire=complete
23. entirely=thoroughly
24. environment=ecosystem
25. envisioned=conceived ofv想象，预想，构思
26. era=period
27. eroded=deteriorated
28. erratic=inconsistent
29. erratic=irregular(不稳定的，古怪的)
30. espanse=area
31. essential=fundamentaladj基础的，本质的，基本的
32. established
33. establishment=formation(establishment n.确立, 制定, 设施, 公司, 军事组织)
34. estimate=calculate
35. etch=cut腐蚀
36. evaluate=judge
37. evaporated=disappeared
38. even=already(恰好,正当)(在But, even by the end of时间……)
39. evenly=equally(evenly adv.均匀地, 平坦地 )
40. evenly=uniformly
41. eventually=ultimately
42. evetion
43. evident=apparent
44. evoke=stimulate
45. exacerbate=intensify
46. exaggerate=embellish
47. exceed=go beyond
48. exceeded=surpassed
49. exceedingly=extremely(exceedingly adv.非常地, 极度地)
50. execrate