题目

Food Waste Did you eat all of your dinner last night? If not, what did you do with the leftovers?  36  Actually, food waste has become a major problem around the world. Recent studies show that almost a third of the food produced globally is lost or wasted. Where it occurs    ___37___Yet the percentage of food loss is about the same in developing countries and wealthy nations. The reasons, though, are very different.    In poor countries, 40 percent of food loss occurs before it reaches the buyer.  38  The long trip in the hot sun can cause the milk to spoil. In industrialized 大多数生物群落在空间上有垂直分层现象，称为群落的垂直结构，引起森林群落中植物和动物垂直分层现象的主要因素分别是 [　　] A． 温度、食物 B． 温度、光照 C． 湿度、温度 D． 光照、食物