精选优质文档-倾情为你奉上Unit 1Part Two: Read and PracticeRead and ThinkII. Answer the following questions according to the text.1.What are the main type of air Pollution?An.: These include smog, acid rain, the greenhouse effect, and holes in the ozone layer.2.Where does exhaust come from?An.: The exhaust comes from burning fuels in automobiles, homes, and industries.3.Why is the amount of carbon dioxide in the air continuing to increase?An.: Carbon dioxide is produced when fuels a
