高中英語(yǔ)必修第三冊(cè)
Book 3 Unit 1 Nature in the balance
Reading 1
The Amazon rainforest: a natural treasure
The world we live in is full of natural wonders. The documentary script below describes the Amazon rainforest, which is home to a wide range of wildlife. Before you read the script, think about the following questions:
· What plants or animals do you know about? What is special about them?
· What do you think this script is about judging from the title and pictures?
The Amazon rainforest: a natural treasure
Welcome to the jungle, a huge sea of green alive with the sounds of animals. This is the Amazon rainforest. As the largest rainforest in the world,it plays a significant role in maintaining the fine balance of the Earth's ecosystem.
The Amazon rainforest crosses into eight countries, including Brazil and Peru, and 5 one overseas region of France, all on the South American continent. With an area of around 6 million square kilometres, the Amazon rainforest is more than half the size of China. The Amazon River, from which the rainforest gets its name, is close to 6,400 kilometres in length——roughly 100 kilometres longer than the Yangtze River. On its journey from the mountains to the ocean, the river supports many different ecosystems. They give this area the richest biodiversity on the Earth: one in ten known species in the world can be found here.
Of the 390,000 plant species known to us,more than 40,00 can be found in the Amazon. This tall and ancient Brazil nut tree produces nuts that we can eat; these water lilies are big enough to lie down on. The forest's different levels support an 15 unbelievable variety of wildlife. At the bottom, there is a system of roots beneath the ground. Above that is the mass of leaf litter on the dark forest floor. The next level is made up of shorter plants with large leaves. Then there are the towering ancient hardwoods, and finally the tops of the tallest trees many metres above the ground. Each level of the forest forms its own little world, home to different kinds 20 of living things.
More than 1,300 species of birds and over 400 species of mammals hide among the jungle's plant life. This jaguar is one example. It has a yellowish-brown coat with black spots. While a significant number of jaguars survive here, they are only one element of this forest's food chain. They feed 25 on at least 87 species,including frogs. These frogs,in turn,feed on insects which eat leaves and fruit. When a jaguar dies, a tiny army of microorganisms helps break down its body and return the nutrients to the earth.
30 The Amazon rainforest breathes life into the planet by fixing carbon and producing over 20 percent of all the Earth's oxygen. Thus, it is often known as the"lungs of the planet”.Moreover, the Amazon rainforest is a treasure house of species that can be used for food or medicine. Yet there is one major danger to these irreplaceable plants and animals: us. Over the past 50 years, about 17 per cent of the rainforest due to human activities such as agriculture and cattle farming. As the impact of human activities continues to grow andthe list of species in dange rof extinction becomes longer we are left witha question: Can we afford to damage the “l(fā)ungs of the planet”?
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