在生态系统中，非生物的物质和能量、生产者、消费者以及分解者紧密联系，彼此作用，构成一个整体．人类是生态系统中的成员，那么人类在生态系统中扮演的角色是（）A．分解者B．生-生物

更多内容推荐

• – Must I get up early tomorrow morning? – No, _________.A．you mustn’tB．I don’t think you have toC．yo
• —Have you finished your homework? —I've done most of it. But the rest ______ too difficult. [ ]
• What will our future ______? No one knows _______. [ ]A. be like; for certain B. is like; for certai
• The city has a population of two million. And more than 65,000 of them old people. [ ]A. are B. is C
• 一般地说，在食物链中随着营养级的递增，生物个体的数量将依次（）A．递增B．不变C．递减D．稍增加-生物
• 如图为一个池塘的生态系统，池塘内有水草、浮萍、水绵、鱼、虾等生物．（1）在此生态系统中，生产者是______（3种），消费者是______（2种）．（2）鱼进行生命活动所需的能量最终来自_-生物
• —Must I go through the radiation (辐射) check when I come back from Japan at the airport these days?—Y
• — Must I finish my homework now?— No, you _____.A. mustn’tB. needn’tC. can’t-九年级英语
• 大多数动物在生态系统中充当（）A．生产者B．消费者C．分解者D．统治者-生物
• Heresome flowers and some money for you. [ ]A. is B. are C. have D. has -九年级英语
• 生物圈中最主要的生产者是指（）A．人B．动物C．绿色植物D．生活在大气圈中的生物-生物
• 一个完整的生态系统的组成应包括（）A．全部的食物链和食物网B．生产者、消费者、分解者和食物网C．非生物部分、生产者、消费者D．非生物部分和生物部分-生物
• 利用所学的知识回答下列问题：（1）大雨过后，蚯蚓纷纷爬出地面的原因是______．（2）人的头癣、灰指甲、脚癣等都是由______真菌引起的．（3）为了保护南极的生态环境，科学工作者不仅-生物
• —Do you know the song Come on, Haixi!—Yes, and I _________sing it well.A. must B. can C. need-九年级英语
• 实验室里有一个封闭状态生态球，已经维持了一年多，各类生物一直生活良好，后来仅仅移动了一下位置，生物就全死了，它原来是放在（）A．恒温培养箱里B．窗台上C．药品橱柜D．冰箱冷-生物
• —Two months ______ quite a long time.—Yes, I'm afraid that he will miss a lot of his lessons. [
• The Science Museum interests me a lot. I enjoy there. A．goingB．to goC．goesD．go-九年级英语
• —How do you like Hangzhou, Mr. Lee? —I've no idea. I ______ there. [ ]A．have gone B．have been C
• 在生态系统中，从总体上看各组成成分储存的能量，排序正确的是（）A．植物的数量＞草食动物＞肉食动物B．草食动物＞肉食动物＞植物的数量C．肉食动物＞草食动物＞植物的数量D．肉食动物＞-生物
• 单项选择。—Whatthe score yesterday? — It 80:82. [ ]A. was, was B. is, is C. are, are D. were, were -七年级英语
• 下列四种微生物：大肠杆菌、蓝藻、枯草杆菌、根瘤菌，其中，属于生产者的是______；属于消费者的是______；属于分解者的是______；具有固氮作用的是______．-生物
• —Let’s go dancing tonight.!—Sorry, I ________.I have to go to my guitar lesson. A. mustn’t B. needn’
• — Susan, would you like to go hiking with us this afternoon?— I'd love to, but Istudy for a tes
• 如图中A表示的是一种鹰在一个群落中的情况，那么B代表的可能是（）A．是该种鹰的天敌种群B．是与鹰有互利共生关系的一个种群C．群落中生产者数量变化的情况D．是被鹰捕食的一个种群-生物
• They _____ here for more than a month. [ ]A. have arrived B. have reached C. have come D. have been
• He said that honesty _____ the key to success. [ ]A. was B. will be C. is D. is being -九年级英语
• The headmaster _______ for more than two weeks. [ ]A. has left B. has gone C. has been away D. has c
• We can make a fire ______ the room warm so that we can chat for a while.A．to keepB．keepingC．keepD．ke
• 生态系统中，生产者主要是______，消费者是指______．-生物
• —Don’t forget ______ your homework. John. —Ok. I'll do it right now.A. doing B. do C. to do -九年
• 在自然界的物质循环中，对物质转化不可缺少的是（）A．生产者和消费者B．消费者和分解者C．分解者D．消费者-生物
• 属于自然界“生产者”，进行光合作用生产有机物，释放氧气的是（）A．水稻B．农民C．传播花粉的蜜蜂D．用于生产酸奶的乳酸菌-生物
• 非生物因素包括______、______、______、______、______、______等多种因素．-生物
• —______ did you sleep last night?—Only five hours. I stayed up late to do my homework.A．How soonB．Ho
• —I am happy that Ito be the host. —Congratulations! [ ]A. choose B. are chosen C. was chosen D. have
• 请你根据如图示回答问题：（1）图中的绿色植物利用太阳光能，制造______，不仅养活了自身，还养活了虫和鸟，所以它是生态系统中的______．图中的虫和鸟是生态系统中的消费者，随-生物
• 如图所示是某生态系统的食物网，请根据图和所学知识回答下列问题．（1）图中的绿色植物利用太阳能，制造有机物，不仅养活了自己，还养活了图中的其它生物，所以它是生态系统中的-生物
• 下列能将复杂的有机物分解为简单物质的是（）A．海藻B．鹰C．蘑菇D．蝴蝶-生物
• —Who will pick you up after the long journey by plane?— Don't worry, my host family ______ me a
• This dictionary______ Tom's. It has Ann's name on itA. might be B. may he C. can't be
• 环境中______的因素，叫生态因素．生态因素包括______和______两类．对于生活在池塘水底同一处的两种水草来说，它们的______因素相同，______因素不同．-生物
• —I won’t go to the concert this evening. I ______ watch the NBA on TV. It’s more exciting.A．had bett
• My aunt ______ here for about a week. [ ]A. has got B. has beenC. has arrived D. has reached -九年级英语
• 农田生态系统中的生产者主要是（）A．农民B．耕牛C．农作物D．杂草-生物
• Li Ming is a new student in our class. He ______ here for only a month. [ ]A. has come B. has been C
• 在下列食物链中的哪个环节，可以发现含有最多的能量？（）藻类→水蚤→鲱鱼→人类．A．藻类B．水蚤C．鲱鱼D．人类-生物
• — The book very interesting. Tell me more about it.— OK. A．areB．isC．amD．be-九年级英语
• Tom and Imembers of Music Club.[ ]A. am B. is C. are D. ／ -七年级英语
• —Can you come to my party on Wednesday?—Sorry, I can't. I___ finish my homework.A. may B. would
• — _ I use your eraser, Rose?— Sure. Here you are.A．MayB．WouldC．NeedD．Must-九年级英语