读“全球C0₂浓度变化”图，回答1—2题。

1、20世纪50年代以来，全球C0₂浓度明显增加的主要原因是

    ①人类消耗的化石燃料急剧增加 ②地震等地质灾害频繁发生

    ③森林毁坏，其面积大量减少 ④人类填海造陆面积过大 [ ]

A、①③

B、②③

C、②④

D、①②

2、为延缓和减轻由于C0₂浓度增加而导致的气候变化与危害，各国政府应[ ]

A、改变能源结构，提高天然气的使用比例

B、遵守国际公约，控制和消减C0₂排放量

C、采用固碳技术，增加新能源污染税费

D、扩大耕地面积，培育新的农作物品种

句型转换。

1. Mary was able to find the way back home. (改为否定句)

    Mary _______  _______ to find the way back home.

2. I don't know what I should do. (改为同义句)

    I don't know what _______  ________.

3. It took them ten days to finish the work. (对画线部分提问)

    _______  ________ did it take them to finish the work?

4. I'd like to buy some tickets to the wonderful concert. (改为一般疑问句) 

                  you like to buy                tickets to the wonderful concert?

5. The book is too expensive for me to buy. (改为同义句)

    The book is               expensive               I can't buy it.