【正确答案】topic The professor says there are two types of ecotourism that benefits our environment a lot. Then can not only reduce the pollution but also repair the damage. example 1 The first type of the so called "green tourism" is to hike into the sites instead of taking buses. The former approach creates less pollution. Besides, buses or other transportation tools will create noise. More importantly, they will emit carbon dioxide simultaneously because the fuel they used usually are oil and gas, then the gas they have discharged would bring a great amount of damage on our environment. example 2 The second type of ecotourism is to inform tourists of the importance of protecting our environment during their journey. For example, one can organise a trip in which tourists are encouraged to pick up the deserted rubbish or plant trees in the deforested area.

【答案解析】[听力原文] M: The world we live in is vast and beautiful. Million of us travel the globe each year to see the places that are often talked about in nature magazines, television or on the internet. But the damage done to our planet by the sheer number of tourists is on the rise and undeniable. Ecotourism, however, is a kind of tourism beneficial to the environment by alleviating the pollution while reversing some of the damage already done, and thus healing our planet. Let's talk about a couple of ecotourism ideas. Firstly, ecotourism helps lower vehicle pollution. In order to travel to some places, tourists sometimes use buses which are noisy and fuel consuming, thus emitting a lot of environmental pollutants. To counter this act, tourists can hike into the sites instead of taking buses or other means of transportation. If you think about the number of tourists visiting a popular tourist area every year, and eliminate the need for buses, there is no doubt that the idea of ecotourism could make a big difference. Another way that could help cut down on pollution at tourist sites is to raise environmentally friendly awareness. By teaching tourists the impact that they are causing before hand, it can possibly persuade some of them to change their plans to a more environmentally friendly alternative. For example, having a kind of tour which makes the tourists replant trees in deforested areas can help repair the damaged forests.