What does the speaker suggest for students who have had colds?A.Take plenty of medicine B.Call up the doctor C.Come to the clinic D.Get proper exercise 请帮忙给出正确答案和分析,谢谢!
What is the main topic of the conversation?A.The development of the automobile B.Declining air quality C.The structure of nitrous oxides D.Air quality management 请帮忙给出正确答案和分析,谢谢!