九师联盟 2022-2023学年高三10月质量检测(新高考)河北 政治答案

九师联盟 2022-2023学年高三10月质量检测(新高考)河北 政治答案，目前答案易对网已经整理了九师联盟 2022-2023学年高三10月质量检测(新高考)河北 政治答案的各科答案和试卷，更多联考试卷请关注本网站。

8.科学家研究某区域中田鼠的种群数量变化，得到该种群在数年内的出生率和死亡率的比值曲线如图所示（其中R=出生率/死亡率)。在不考虑迁入和迁出的情况下，下列叙述正确的是A.该区域中田鼠种群存在垂直结构和水平结构B.该田鼠种群数量增长曲线为“S”形，C时种群密度最小C.A一D期间田鼠种群数量先增加后减少，其中C~D期间田鼠种群数量一直在减少D.若不考虑其他因素，仅由图判断，A、B时对应的种群年龄结构分别为增长型和衰退型D时间【答案】C【解析】垂直结构和水平结构属于群落的特征，不属于种群特征：据图分析，种群的出生率和死亡率的比值先大于1后小于1，说明种群数量先增加后减少，则D时种群密度最小，且该曲线不符合“S”形增长：根据以上分析可知，田鼠种群数量在A~D期间先增加后减少，其中C一D期间R<1,种群数量一直在下降；A、B时R>1,种群数量都在增长，所以若不考虑其他因素，A、B时对应的种群年龄结构均为增长型。

1.续写词数应为150左右；2.请按如下格式在相应位置作答。Alone on the long flight to Los Angeles,I was filled with doubts,as I had never lived with a strange family.How would I manage to live with people I had never met before?What if the host family and I didn't get along?Would I fit in?I needn't have worried.From the first moment at the airport where they had come to receive me,Iknew things would be all right.Their smiles and their words of welcome as they greeted me felt like a warmembrace.I could not have found a kinder,more generous family than theirs.The kindness of the host family and Ken gave me all the practical and emotional support I needed to train in aswimming club of California.During my stay there,it was the mother of my host family who drove me to andfrom the training center every day.She could cook delicious food and she knew how to comfort me while I washomesick.The training was hard,yet it was Ken who always showed me concern and encouraged me to keepgoing.My swimming performance improved slowly but steadily.From those kind people I have learnedgenerosity,love,and kindness.