– Where are my new sneakers? Have you seen them? -- How __________ I know? I’m your sister, not your servant. A. shall B. should C. will D. might 答案:B有关生态学知识指导生产实践的叙述,错误的是( )
A、种群数量变化规律--畜牧业可持续发展B、生物群落演替规律--湿地生态恢复工程C、生物富集作用--物质循环利用生态工程D、生态系统稳定性--“三北”防护林建设