题型:问答题 运用生态系统能量流动规律分析下列四项中,对于人来说,能量利用率较低的是[ ]A.在森林中,使能量多储存在木材里B.在草原牧场,使能量多流向牛和羊C.能量流经初级消费者→次级消费者→三级消费者(人的食物)D.在养鱼池,让有机肥料以腐屑形式被鱼类或饵料动物直接摄食 查看答案
题型:问答题 ----_____he dropped out of school? ----His family has run into financial difficulties.A.Why was it thatB.Why was thatC.Why was that itD.Why was it 查看答案