2 . 怎样保护脆弱的生态环境是最令人关注的问题。(疑问词＋动词不定式)
________________ was among the top concerns.

3 . 词性转换
1. steady adj.稳定的→________________ adv.平稳地
2. mass n.块，团→________________adj.巨大的
3. economy n.经济→________________ adj.经济的
4. disturb v.干扰，扰乱→_________________ adj.令人不安的→________________ adj.烦恼的；心烦意乱的→________________n.打扰；骚乱
5. operate v.经营；操作→________________ n.经营者→________________ n.操作；经营；运转；手术
6. conserve v.保护；节省→________________n.保护→________________n.（动植物或古旧建筑的）保护工作者；环境保护主义者
7. apply v.申请→________________ n.申请人→________________ n.申请
8. favour n.支持，赞同→________________ adj.支持的
9. advertise v.（为……）做广告（宣传）→________________n.广告
10. negotiate v.谈判，协商→________________adj.可协商的→________________ n.谈判，协商
11. prefer v.更喜欢，偏爱→________________ n.优先(权)
12. qualify v.使具有资格→________________n.资格，技能条件→________________ adj.有资格的，合格的

4 . 据说，亚历山大大帝和马可·波罗在印度参观过这样的一棵树。(be said to have done...)
Alexander the Great and Marco Polo ________________ such a tree in India.

6 . 无论你的看法如何，数千年来人们一直通过艺术来表达他们的想法和看法。(whatever引导的让步状语从句的省略)
________________, people have been expressing their thoughts and ideas through art for thousands of years.

7 . 正如谭所说，中国音乐要承载人文精神的“共同理念”才能被全世界认可。(as引导非限制性定语从句)
________________, Chinese music should carry “universal expression” of the human spirit so as to be recognized by the whole world.

8 . Try _________ that one and decide which one to buy. (用适当的词填空)

9 . Its many green counties is a true feast for the eyes, with its rolling green hills dotted with sheep and cattle.
仿写：随着越来越多的森林被破坏，一些动植物正面临着灭绝的危险。
____________, some animals and plants are facing the danger of dying out.