1. (2022七上·龙湖期中) 以下是一篇关于地球日的科普文章，阅读该文章，并回答以下5个问题。

The World Earth Day is on April 22^nd every year. On that day, people do different things to protect(保护) the Earth.

People celebrated(庆祝) the first Earth Day about over 50 years ago. They celebrated it in the USA. But today, people in many countries celebrate the Earth Day. They come from China, Canada France and so on(等等).

As children, you can also do many things with friends and family on the Earth Day. You can plant trees or clean up a park or street. You can turn off(断开) the lights or the computer when you don't use it. You can ride a bike or walk to school. Walking or riding a bike can help keep the air clean.

Everyone can do something to help protect the Earth.

1. （1） Why do people have the World Earth Day?
3. （2） When did people celebrate the first Earth Day?
5. （3） What can you do when you don't use the lights or the computer?
7. （4） How can we keep the air clean?
9. （5） As children, can we do anything to protect the Earth?