同学们,你们知道世界三大粮食作物是什么吗?小麦、水稻、玉米被称为世界三大粮食作物。今天是“世界粮食日”,本周为我国“爱惜粮食、节约粮食”宣传周。今天,让我们将更多目光投向人们赖以生存的粮食。也许很多人会说：我们早已远离食不果腹的年代,吃饱饭、吃好饭已经成了司空见惯的事情,还有谁会在意粮食的由来,还有谁会在意随手丢弃的粮食?然而,现实情况令人堪忧：一方面,全世界人口与日俱增,粮食供应日益紧张,部分地区粮食短缺现象日益严重；另一方面,浪费粮食的行为屡见 Students, you know what is the world’s three major food crops? Wheat, rice, corn is known as the world’s three major food crops. Today is the “World Food Day,” this week for China’s “cherish food, save food” propaganda week. Today, let us focus more attention on the food that people depend on for survival. Many people may say: We have long been away from the age of underage, eat enough to eat good food has become a commonplace, who else will care about the origin of food, and who would care about readily discarded food? However, The reality is worrisome: on the one hand, the world’s population is increasing day by day, the food supply is getting increasingly tense and the food shortage in some areas is getting worse day by day. On the other hand, it is not uncommon to waste food