1. ignore=pay no attention=not pay any attention=take no notice=not take any notice忽略，无视 v.

2. encounter=face=confront=meet遇见，遭遇v.

3. mistaken view=misconception错误的观点n.

4. easy to reach=accessible容易达到的adj.

5. change=modify 改变v.

6. destruction=destroy=loss毁坏n.

7. investigate=make inquiries=enquiries=go into=probe=look into 调查v.

8. where=geographical location 表地点

9. important=vital=essential=crucial重要的adj.

10. reason=cause=factor=origins=root=stimulus=impetus原因n.

11. protect=guard=safeguard=shield=conservation保护v.

12. newspapers, television=media媒体n.

13. where to live=habitat居住地n.

14. get warmer=global warming变暖n.

15. contribute to=play a part有助于v.

16. survive=continuing existence幸存，活下来v.

17. curriculum=course=syllabus课程n.

18. link to=be connected with=be linked with把和相联系v.

19. underdeveloped=degenerated=rudimentary不发达的adj.

20. poor=bad=badly=not very good=no good at something=weak贫穷的，可怜的adj.