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30.【参考答案】[文](8分)(1)生产[章]者(1分垂直(1分[来])生态系统(或水库[自]生态系统、湿地生态[知]系统)(1分)藻类[嘛]·链,糖(2)·浮[答]游动物(1分)二、[案]第三(1分)适度捕[网]杀熊、鳙的天敌(1[文]分)(3)定期适度[章]捕捞能,辅:定期合[来]理投放链、辅鱼苗;[自]控制性捕杀链、鳙的[知]捕食者:控制人类活[嘛]动(工业、农业、旅[答]游)对水库生态系统[案]的负面影响(2分)[网]【命题点拨】该题重[文],点考查了生物与环[章]境的相关知识点,并[来]考查了学生解决实际[自]问题的能力【详解详[知]析】(1)引起水库[嘛]生态系统“水华”的[答]藻类,可利用太阳能[案]合成有机物,属于生[网]产者。生态系统是指[文]一定区域中所有生物[章]以及无机环境的总和[来],的(2)在该食物[自]网中,藻类属于第一[知]营养级,浮游动物以[嘛]藻类为食,属于第二[答]营养级,链、糖以藻[案]类和浮游动物为食,[网]属于第二、第三营养[文]级。而在投放蛙、螭[章]鱼苗后,为了保证其[来]存活率,可以适度捕[自]杀熊、鳙的捕食者。[知](3)为了实现生态[嘛]效益和经济效益的双[答]赢,要注意控制艇,[案]鳙的数量,如定期捕[网]捞、适度补苗等。还[文]要注意控制人类活动[章]对该生态环境的负面[来]影响。/114
it alsohelpu[自]s develop the habit of saving money.hel[知]ps第二节书面表达[嘛]One possible version:([答]TDear Grace,MI am writing to tell you that I won't be able tokeep my appointme[案]nt to discuss tradition[网]al Chinesepa[文]intings with you because my mother fell ill and IWhave to look after her.I sincerely[章] apologize[来] to you forany inconveni[自]ence caused by the unexpecte[知]d change.I([嘛]1suggest we reschedul[答]e it from 3 pm tomorrow to theMsame time next Saturday.[案]Will that be fine for you?The good news is that an exhibitio[网]n of Chinese paint-ing[文]s is to be held this weekend.A[章] visit there will helpyou better understan[来]d tradition[自]al Chinese paintings[知].Looking forward to your reply.NYo[嘛]urs,Li Hua第7页(共