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阅读理解阅读短文，从所给的三个选项中选择一个最佳答案，并将其字母标号填入题前括号中。   For many girls, having long beautiful hair is something to be proud of. Rachel Barrett, 15, recently cut her long hair and looked like a boy. But she was also proud of herself. She donated her hair to a charity and raised a lot of money.   Barrett is a middle school student in Britain. On Nov.16 at her school’s talent contest, Barrett had her hair cut off in front of around 300 students. The hair would be used to make wigs for children with cancer. She has rais请阅读以下短文并回答相关问题：“不必说碧绿的菜畦，光滑的石井栏，高大的皂荚树，紫红的桑椹；也不必说鸣蝉在树叶里长吟，肥胖的黄蜂伏在菜花上，轻捷的叫天子（云雀）忽然从草间直窜向云霄里去了．…油蛉在这里低唱，蟋蟀们在这里弹琴．”（选自鲁迅先生《从百草园到三味书屋》）（1）“百草园”这个生态系统的结构包括、 ．（2）“百草园”的枯枝落叶或动物尸体不会大量堆积，从生态学角度分析原因： ．（3）“百草园”中某昆虫种群中雌雄个体通过气味相互识别，这属于信息，说明离不开信息传递．请再找出“百草园”中体现生态系统信息传递的一个例子： ．（4）图为“百草园”生态系统中能量流经第二营养级的示意图，则B、D 的含义分别是 、 ．