Unit 1 Nature in the balance Let us not, however, flatter ourselves overmuch on account of our human activities over nature. For each such victory nature takes its revenge on us. --Friedrich Engels 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. Para 1 Welcome to the jungle, a huge sea of green alive with the sounds of animals. This is the Amazon rainforest. As the _____(large) rainforest in the world, it plays a significant role in _____(maintain) the fine balance of the Earth's ecosystem. Para 2 The Amazon rainforest crosses into eight countries, _____(include) Brazil and Peru, and 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 _____ the rainforest gets its name, is close to 6,400 kilometres in length--roughly 100 kilometres _____(long) 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 _____(know) species in the world can be found here. Para 3 Of the 390,000 plant species known to us, more than 40,000 can _____(find) in the Amazon. This tall and ancient brazil nut tree produces nuts ____ we can eat; these water lilies are big enough to lie down on. The forest's different levels support an 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 _____(form) its own little world, home to different kinds of living things. Para 4 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 _____(significance)number of jaguars survive here, they are only one element of this forest's food chain. They feed on at least 87 species, including frogs. These frogs, in turn, feed on insects which eat leaves and fruit. _____ a jaguar dies, a tiny army of microorganisms helps break down its body and return the nutrients to the earth. Para 5 The Amazon rainforest breathes life into the planet by fixing carbon and _____(produce) over 20 per cent of all the Earth's oxygen. Thus, it is often known ___ 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. Para 6 Over the past 50 years, about 17 per cent of the rainforest _____ (disappear) due to human acti ... ...
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