试题与答案

研究所对一条河流生态系统进行了几年的跟踪调查,发现某种鱼迁入此生态系统后的种群数量增

题型:单项选择题

题目:

研究所对一条河流生态系统进行了几年的跟踪调查,发现某种鱼迁入此生态系统后的种群数量增长率随时间的变化呈现如下图所示曲线,则在t1时该种群的年龄组成类型、能反映该种群数量变化的曲线分别是()

A.衰退型和①

B.增长型和②

C.衰退型和③

D.增长型和④

答案:

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37.A.beyond                   B.over                       C.across                     D.through

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39.A.nest                        B.baby                       C.body                      D.egg

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42.A.horror                    B.surprise                  C.delight                    D.disappointment

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