The Earth is about 4,600 million years old. People live on the Earth for only 35,000 years. But we change the Earth in many ways. Many things we do are good, but some are not good for the Earth.

Water pollution

A lot of people, birds and fish die each day because of water pollution. Factories pollute the water. As a result, the water in many rivers and lakes is very dirty now.

Air pollution

In big cities, factories, cars and buses are the main causes (原因) of air pollution. Many people in cities now have health problems. For example, Mexico used to be a beautiful city and was a good place for people to live, but today there is lots of PM2.5 in the air. And many people get ill because of the polluted air.

Soil (土壤) pollution

In order to have a better harvest (收获), some farmers use chemicals (化学物质) in their fields. That’s bad for the soil.

Hope for the future

These problems are very bad for our future, so all of us should do something to protect the environment. If we can stop pollution, the Earth will become more and more beautiful.

【小题1】How old is the Earth?

A．About 3,500 million years old.	B．About 3,700 million years old.
C．About 4,600 million years old.	D．About 4,800 million years old.

【小题2】What makes the Earth change a lot?

A．Plants.

B．Cloud.

C．Animals.

D．People.

【小题3】How many kinds of pollution are talked about in this passage?

A．Two.

B．Three.

C．Four.

D．Five.

【小题4】Which of the following is NOT true?

A．The water in many rivers is very clean now.

B．Mexico was a good place to live in the past.

C．Factories, cars and buses can cause air pollution.

D．Now more and more farmers use chemicals in the fields.

【小题5】What is the purpose (目的) of the passage?

A．To ask us to learn about the Earth.	B．To ask us to thank the Earth.
C．To ask us to enjoy the Earth.	D．To ask us to protect the Earth.