题目

From red apples and yellow lemons to blueberries and green melons, fruit comes in many different colors. 【1】.According to Lu Wei from the Chinese Academy of Sciences, fruit colors actually come from their different pigments（色素）.These pigments appear differently, depending on the fruit's environment. 【2】.To find out how environment influences fruit colors, Chinese scientists studied more than 280 different fruit colors. They found that red fruit usually grow in cooler places. And instead of just growing in one place, you can find them growing in many places around the world. 【生态工程建设的核心环节是A.拟定目标与本底调查B.系统分析C.可行性评价与决策D.技术设计