— What is it?
— .(它是地球)
We live on the Earth. The green and brown parts are forests and land. The blue parts are oceans. The Earth1very clean and beautiful in the past, but now some parts of the Earth2dirty. Sometimes people throw rubbish3rivers and oceans. Sometimes people cut down too many trees. Smoke from cars and factories makes the air dirty. The Earth gets sick. So people should stop cutting down so many trees. People should plant4trees. People should stop throwing rubbish. People should stop using plastic bags. People should work together 5keep the Earth clean and healthy.
A．Atlantic Ocean(大西洋)
B．Indian Ocean(印度洋)
C．Arctic Ocean(北冰洋)
D．Pacific Ocean(太平洋)
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A．Europe(欧洲) B．Africa(非洲)
C．Asia(亚洲) D．Oceania(大洋洲)
E．North America(北美洲)
F．Antarctica(南极洲)
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—They are ________.
Water covers (覆盖) 70% of the Earth. Many fish and sea animals live in rivers, lakes, seas and oceans on the Earth.
In the oceans, you can find small beautiful animals—starfish (海星) and sea horses (海马).
You can find some big animals. Dolphins are big and clever. They love playing with people.
People also get food from the oceans. The seafood we eat is from the oceans. Fishermen use nets (网) to catch fish in the deep sea.
The oceans are important to all animals on the Earth. Animals get sick when the water is dirty. We must keep the oceans healthy.
