2014
高考英语阅读理解精英训练题（5）及答案阅读理解 there is increasing evidence that the impacts of meteorites (陨星) have had important effects on earth, particularly in the field of biological evolution. such impacts continue to pose a natural hazard to life on earth. if an impact is large enough, it can disturb the environment of the entire earth and cause an ecological catastrophe. t
