READINGS

摘要：

In the past,a large part of the American diet was made of convenience (方便) foods (or junk foods) such as pizza,cookies,potato chips,hamburgers,and some others.These days however,most Americans are more concerned (担心) about what they eat.Junk foods may taste good and may be very convencient,but people now realize that they can cause health problems.

在线出版日期：2013-05-08（万方平台首次上网日期，不代表论文的发表时间）

页数：共2页

页码：28-29