Effects of long term use of pesticides include ( ) A: imbalances in ecosystems B: develop new dominant pest species C: lose keystone species. D: Beneficial organisms and even natural enemies of the pests may be among the species eliminated by pesticides

①Competition law appears to be the only way to address these imbalances of power. ②But it is clumsy.  未知类型：{'label': 'questionDesc', 'content': '请判断两个句子的逻辑关系', 'isMemberControl': 0, 'type': 181} 未知类型：{'label': 'source', 'content': '英语二2018年Text3', 'isMemberControl': 0, 'type': 181} A: 转折 B: 目的 C: 解释