Ⅰ. 用本单元恰当的单词补全语境
1. breathe a sigh of relief 松了一口气
2. burst into laughter 突然笑起来
3. a loss of nine hundred million pounds 亏损九亿英镑
4. be affected by a moving story 被一个动人的故事所感动
5. appreciate the beauty of nature 欣赏大自然的美
6. hunt for food for their young 为它们的孩子找食物
7. contain a lot of salt 含有很多盐分
8. decrease the damage to the environment
减少对环境的破坏
9. do harm to animals 伤害动物
10. a certain number of people 一定数量的人
11. must respond to public request 必须回应公众的要求
12. have mercy on them 怜悯它们
