The line graph compares datas of Australian teenagers' consumption of pizza, fish and chips and hamburgers in different years from 1988 to 1999. At the beginning, fish and chips took up the most part and the number of it is at least 10 times of the other two kinds of fast food. But after that, the number of fish and chips kept down totally while the numbers of pizza and hamburgers kept climbing. In 1999 the number of hamburgers was bigger than that of fish and chips. In 1000, the number of pizza increased above that of fish and chips. After 1000, hamburgers had been the most fast food that Austrlian teenagers consumned and pizza the second, fish and chips the last. It can be seen that in 1000, both the numbers of pizza and hamburgers were about two times of fish and chips.