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was first found
was known for
reintroduced
Try to make a report according to the hints.
The importance of protecting the Earth
1.Now the Earth is destroyed, for example,…
2. As students, what can be done by us to protect the Earth?
3. What will happen after we protect the Earth?
（根据提示，描述保护地球的重要性, 内容要包含以下三部分。开头已给出，注意用连接词。 ）
The Earth is considered to be the only home of human beings.
However, the Earth is destroyed by us. For example, trees are cut down. Many animals are endangered. The air is polluted. I think human beings will be punished for it one day.
As students, we don’t need to do big things. We can just start out small. Firstly, the rubbish should be picked up whenever we see it. Secondly, the floor can be cleaned every day. At last, desks should be put away.
If we do these things, the Earth will be more beautiful. Let’s try our best to protect the Earth.
The structures of the passive voice.
Write a passage about the importance of protecting the Earth.