根据短文理解，回答下列各题。

      CCTV reported that every year Chinese people throw away a lot of food; it can feed 200 million people for a year.

      Do we have too much food? Of course not. According to the UN World Food Program, there were 925 million hungry people around the world in 2010. Six million children die of hunger every year.

      Luckily, a number of people have realized the importance of saving food. Last November, Li Hong, a waitress in a restaurant in Nanjing, lost her job because she took some leftover(剩余的)food home for her son. Many people are by her side and criticized(批评)the waste behavior.

      What should we do in our daily life to waste less food? Here are some tips:

       ①Don't order too much food in a restaurant. Only order as much as you want to eat. If you cannot eat all the food you order, take the rest of it home.

       ②Don't be too picky(挑剔的)about food. Some food may not taste great, but your body needs it.

       ③Don't keep too much food at home, especially vegetables and fruit.

     “Every grain on the plate comes from hard work(谁知盘中餐, 粒粒皆辛苦).” It tells us everybody must save food.

以下一些单质和氧化物之间可发生如图所示的反应：其中，氧化物（Ⅰ）是红棕色固体，氧化物（Ⅱ），（Ⅲ），（Ⅳ）在反应条件下都是气体．

（1）氧化物（Ⅰ）的化学式是　 ____；氧化物（Ⅱ）的化学式是　 ____　；

（2）反应①的化学方程式是 ____；反应②的化学方程式是 ____；反应③的化学方程式是 ____

近日，国家食药监管总局公布了今年第二阶段19类食品及食品添加剂监督抽检信息。瓶（桶）装饮用水、纯净水等微生物超标问题仍较为突出，不合格率超过两成，791种各类饮料被曝不合格，其中饮用纯净水、天然矿泉水、其他瓶（桶）装饮用水样，抽检样品不合格就达775种，占97.97%。不合格样品中，也不乏乐百氏、汇、娃哈哈、怡宝等知名品牌产品。食药监总局已责令相关省市，对不合格产品及企业依法查处。