题目

When we Americans shop at the grocery stores today, we don’t seem to be surprised at the sight of strawberries in the winter or perfect tomatoes from Holland. In the space of a generation, we’ve become accustomed to eating food that’s never grown roots in local soil. In fact, most produce(农产品) grown in the United States travels an average of 1,500 miles before it gets sold. Trucking, shipping and flying in food from around the country and the globe has a very bad effect on the environment and on public health. Take grapes for example. Every year, nearly 270 million pounds of grapes（07江苏卷）为研究环境污染物对某湖泊中生物的影响，一组学生开展了研究性学习。他们首先选取了该湖泊中5种不同的生物A、B、C、D、E，并对其进行消化道内食物组成的分析；然后又请当地一所湖泊研究所的专家对这5种生物体内2种污染物的含量进行了测定；再将研究数据绘制成下表。生物种类消化道内食物组成千克体重污染物含量／mg汞某种杀虫剂A鱼(甲)鱼(乙)7896B河蚌水蚤、小球藻2557C小球藻/35D鱼(乙)水蚤1031E水蚤小球藻515(1)为更直观地表达研究结果，请尝试利用上表中的数据，在所给坐标上规范绘制柱形图，以比较5种生物体内2种污染物的含量。请在答题卡指定位置作答。(2)根据上表提供的信息，以食物网的形式表示5种生物之间的营养关系(以A、B、C、D、E代表5种生物)。                                                     _____