题目

— Congratulations! Among the best pictures in the competition, I found _________. When did you draw it?— During the trip to the Yellow Mountain _________ May.A．yours; inB．yours; onC．you; inD．you; on 答案：A解析:此题重点考查名词性物主代词的用法和介词in的用法，在几月份要用介词in。造成酸雨的主要物质是A．甲烷和二氧化碳 B．二氧化硫和一氧化碳C．一氧化碳和二氧化碳 D．二氧化硫和二氧化氮