题目: 生活在一个生物群落的两个种群(a,b)的数量变化如下图,下列判断正确的是()A.a种群与b种群为捕食关系,a种群依赖于b种群B.a种群与b种群为竞争关系,竞争程度由强到弱C.b种群为"J"型增长,始终受到a种群的制约D.a种群为"S"型增长,其增长受本身密度的制约 答案: 参考答案:D
题型:选择题 There are countless _____ leaves as if they were a red blanket _____ the ground.[ ]A. fallen; coveringB. falling; covered C. fallen; covered D. falling ; covering 查看答案