充足的日照是提高房屋舒适度的重要因素。我国北方甲城市（（38°N, 114. 50E)某住宅小区（如图所示，a为南北两楼的楼间距），在大寒日正午时，南楼阴影刚好位于北楼楼脚处。节气为大寒时，该日甲城市的昼长是10小时。下表示意部分节气的日期及太阳直射点大致纬度。大暑日时，住宅小区北面窗户最早见到阳光照进来的时间约为（  ）

Different countries have different food, such as French fries, Italian pizza and so on. In China, fast food is becoming more and more popular these days. For example, McDonald's and KFC. Why do Chinese people like fast food so much? There are many reasons. First, it is quick. It takes little time. Second, it is easy to carry. Third, people like the restaurant's relaxing environment and American style. Though it tastes good, fast food generally contains little nutrition (营养). If you want to have a healthy body, do not go to fast food restaurants too often. Eat more fruit and vegetables.

若x＞y，则下列不等式中不成立的是（ ）

江南历史悠久，物产丰饶，景色优美，人才辈出。我们热爱祖国，也要热爱自己的家乡。据此回答以下问题。