题目

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项, 选项中有两项为多余选项。Since the 1980s eco-tourism has grown and grown. It is the fastest growing type of tourism.If done well, eco-tourism has several advantages. It is kinder to the environment. 【1】This means that more natural habitat is protected and that the resources for building come from sustainable (可持续的) sources.Another advantage is that people in the developed world through eco-tourism get to experience places of great natural importance as well as communicating with local peo You __________drive on the left-hand side of the road in England.     A. must            B. can               C. may             D. might