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A natural treasure
Welcome to the Amazon rainforest! As the(1)______(large)rainforest in the world,it plays an important role in keeping the earth's ecosystem balanced.
The Amazon rainforest(2)______(cross)eight countries and one region.(3)______ an area of about 6 million square kilometres,it's more than half the size of China.The Amazon River,where the rainforest gets(4)______(it)name,is about 6,400 kilometres long.On its way from the mountains to the ocean,the river supports many different ecosystems.
Different levels of the forest support a huge variety of wildlife.Each level is like its own small world,home to different t(5)______(live)things.
Over 2,000 species of birds and mammals hide among the jungle's plants.Take the jaguar(美洲虎)for(6)______.It has a yellowish-brown coat with black spots.Though many jaguars live here,they're just one part of the(7)______(forest)food chain(食物链).There are also some frogs that feed(8)______ insects which eat leaves and fruit.When a jaguar dies,a small group of microorganisms breaks down its body and returns nutrients to the soil.
The Amazon rainforest gives life to the planet by(9)______(take)in carbon dioxide and producing over 20 per cent of all the earth's oxygen.Also,it's a treasure house of species used for food or medicine.But there's a main threat to these precious plants and animals:humans.
As the influence of human activities like agriculture and cattle farming keeps growing,and the list of endangered species gets(10)______(long),we have a question:Can we afford to damage the “ lungs of the planet "?
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