2016年12月大学英语六级考试真题(第1套)   O. Warrant And it is clearly up to the current generation of leaders from high-emitting nations to decide whether they want to be remembered as climate change tyrants or pioneers.               D. Putting in effect the policies in the agreement at once. Carli says that one of the most significant things about his study is that it provides new early-warning signs for parents, teachers and mental health-care providers. And early identification, support and treatment for mental health issues, he says, are the best ways to keep them from turning into full-blown disorders. D. It sheds new light on how unhealthy behaviors trigger mental health problems. 随着生活水平的提高，度假在中国人生活中的作用越来越重要。过去，中国人的时间主要花在谋生上，很少有机会外出旅行。然而，近年来中国旅游业发展迅速。经济的繁荣和富裕中产阶级的出现，引发了一个前所未有的旅游热潮。中国人不仅在国内旅游，出国旅游也越来越普遍。2016年国庆节假日期间，旅游消费总计超过4000亿元。据世界贸易组织估计，2020年中国将成为世界上最大的旅游国，在未来几年里将成为出境旅游支出增长最快的国家。