大学体验英语视听说3unit1课件.ppt

第三册;UNIT 1; Nothing is more terrible than ignorance in action.;Background Information; Although animal extinction is part of the natural cycle, if all the species disappeared leaving only us humans behind, the human race would not be able to survive. The rapid urbanization of cities in modern times poses a great threat to the existence of some animals. Along with the loss of the natural habitats, man-made activities add fuel to the flames, accelerating the rate at which species disappear. In this unit, endangered animals in America and other countries will be introduced. Students will get to know the current situation of some animal species through reading, listening and viewing. Various activities will inspire students to talk about human’s impact on nature by using the words and expressions in this unit. Finally, they will conduct a poll on “college students’ awareness of endangered species in China” with their peers.;Background Information;Basic facts ● There are over 385 threatened species in China (according to the IUCN Red List) ● Giant pandas have lost half their habitat between 1974 and 1989 ● In the past century, the world lost over 90% of its tiger population; in China, there are only about 90 tigers left in the wild ● Endangered species in China include the giant panda, golden monkey, South China tiger, Siberian tiger, Asian elephant, black-necked crane, crested ibis, saunders’ gull, dugong, Yangtze river dolphin, plus many lesser-known species. Key threats ● Habitat loss, fragmentation, and degradation because of human activities such as logging or mineral exploitation ● Wildlife trade and the illegal hunting of species such as musk deer and bears, whose body parts are used in traditional Chinese medicines ● Pollution and climate change ; Solutions The best way to preserve biological diversity is to maintain flora and fauna in their natural ecosystems. This can be achieved by controlling unsustainable actions such as poaching, as well as b