A. It was towed away by the police. B. It was stolen although it was properly parked. C. It was stolen because it was parked in the open. D. It was towed away for repair. 参考答案:A
第18题: [多项选择]水体富营养化与下述何种物质增力口有关 A. 碳 B. 磷 C. 钾 D. 氮 E. 硫 参考答案:B,D 答案解析:水体富营养化(eutrophica- tirm)是指在人类活动的影响下,生物所需的氮、磷等营养物质大量进入湖泊、河口、海湾等缓流水体,引起藻类及其他浮游生物迅速繁殖,水体溶解氧量下降,水质恶化,鱼类及