六、根据语篇内容，从方框中选择合适的单词并用其正确形式填空
colour lie solve about lead
support healthy sad nature home
Nature is full of surprises. In the (1) world, there are ecosystems to (2) life in different ways. These ecosystems, like forests, oceans and deserts, all play an important role.
Forests are (3) to trees and animals. They help people to clean the air. In a forest, there (4) a network of roots (根系网络) that helps plants grow. Knowing something (5) this system shows how nature is connected.
Coral reefs are another example. They look like (6) underwater castles to some fish and other sea animals. However, they also need clean water to survive.
Ecosystems provide food, water and homes for all. Keeping them (7) is important. (8) , human activities damage them and (9) to many problems. Let’s try hard to care for nature and its amazing ecosystems, though (10) the problem is not an easy thing.

1. natural
2. support
3. home
4. lies
5. about
6. colourful
7. healthy
8. Sadly
9. lead
10. solving

七、补全对话
根据对话情景，在每个空白处填上一个适当的句子，使对话意思连贯、完整。
Gigi: Do you know why we need to protect the ecosystem?
Nancy: (1) . Can you tell me?
Gigi: Well, a healthy ecosystem provides us with clean air, water and food.
Nancy: (2) . What else does it do?
Gigi: (3) .
Nancy: That’s interesting.
Gigi: Protecting the ecosystem means protecting our own future.
Nancy: It is true. (4) ?
Gigi: Well, we can protect natural habitats by doing volunteer work.
Nancy: (5) .
Gigi: Great idea!

1. Not really.
2. That’s amazing.
3. It also helps keep the balance of nature.
4. So how can we protect the ecosystem?
5. We can also use fewer plastic bags.