在一个生态系统中，越多，在能量流动中消耗的能量就越多，所以大多数食物链只有_____个营养级。-八年级生物

更多内容推荐

• J K Rowling jumps farther than ______ in her class.A．any other boysB．the other boysC．any boyD．anothe
• We all know that two and one is three. Here "is" means "_____". A. = B. %C. <
• 如图为某生态系统中的食物网示意图，若种群E含有的总能量为8.6×108千焦，种群B含有的总能量为1.7×108千焦，则从理论上讲，种群A至少可获得的能量为（）A．8.6×10千焦B．1.7×-生物
• 在一个森林生态系统中，不能缺少的应该是（）A．生产者和分解者B．生产者和消费者C．消费者D．分解者和消费者-生物
• 句型转换：就换线部分提问。1. My grandfather is 80 years old._______ _______ _______ your grandfather? 2. I'd
• We went to the beach last Sunday, and we had great fun _____ volleyball.A．playB．playingC．playedD．to
• 阅读材料回答问题：为了深入探究生态系统的结构和功能，美国科学家于1984年开始兴建一个完全封闭的生态实验室______该实验室有半个足球场那么大，在巨大的钢架玻璃罩内，有微-生物
• — Congratulations! You’ve got the first prize in the English Contest.—_____ it be true? It’s unbelie
• 按要求改写句子。1. Sometimes you're supposed to come early. (改为否定句)Sometimes you _______ _______ suppos
• 在“”这个食物链中，占有能量最多的和含有害物质量最多的是（）A．草、蛇B．鼠、鹰C．蛇、鹰D．草、鹰-生物
• 某生态系统中的4种生物a、b、c、d构成一条食物链，一年输入的能量如下表：生物种类abCd能量值（焦耳/平方米）141.1×10515.91×1050.88×105871.27×105该生态系统中，数
• 下列关于生态系统中能量流动的叙述，不正确的是（）A．流经生态系统的总能量是绿色植物所固定的太阳能总量B．生态系统的能量流动是逐级递减的C．生态系统的能量流动是单向不循环的-生物
• 生态系统中，能把有机物转变成无机物，把无机物转变成有机物的分别是（）A．消费者和生产者B．分解者和生产者C．分解者和消费者D．消费者和分解者-生物
• —_____ you _____ English every morning? —Yes, but now I ______ Chinese. [ ]A. Are, reading, read B.
• 如图是草原生态示意图，请回答：（1）从图中可以看出，生产者与消费者之间的关系，主要是______关系，这就形成了______．（2）此图中共有______条食物链，最长的一条食物链可表示为-生物
• Reading in bed isn’tour eyes. A．good atB．weak inC．bad forD．good for-九年级英语
• —Lily,______ do you study for a math best? —By asking my teacher for help.A．howB．whoC．whyD．what-九年级英
• ---Do you know why Anna hasn’t come to school today? ---I’m not sure. She _______ be ill.A．canB．shou
• How _____ your trip to London last vacation? [ ]A. is B. was C. were D. didd-八年级英语
• 生态系统中的生产者主要是指（）A．进行生产创造的人类B．以捕捉其他生物为食的动物C．能利用光能，制造有机物的植物D．能分解动植物遗体，在物质循环中起作用的细菌、真菌等-生物
• “落花不是无情物，化作春泥更护花”这句话从生物学角度分析，落叶之所以能化作春泥护花，是因为有了（）的分解作用．A．生产者B．消费者C．分解者D．阳光-生物
• — _______ you surprised _______ me at your home, Kitty? —No, the sun shines ________ the window and
• ______ you afraid of ______ late for school? [ ]A. Do … be B. Are … be C. Do … beingD. Are … being -
• 生态系统除了有生物外，还有非生物部分．______．-生物
• —Whose exam paper is it? —It be Li Lei's. He always forgets to write his name on it . [ ]A. can
• Must I hand in my exercise book now, Mr. Zhao? - No, you __. You may give it to me tomorrow. A, need
• – Whose ping pong bat is this? -- I’m not sure. I think it ______be Tom’s.A．mightB．mustC．willD．can’t
• The policeman ______ the building ______ a thief at the moment. [ ]A．searching; for B．searches; for
• 绿色植物是生物圈中的______．-生物
• 下列哪一项是属于消费者与生产者的关系？（）A．蝗虫吃庄稼B．狼捕食兔子C．细菌使动物体腐烂D．青蛙捕食昆虫-生物
• —Hello, Mike. Long time no see. Where are you? —Oh, not only my parent but also I _______ Wuhan for
• Her new company is far away. She _______ take the subway to work. [ ]A. must B. are going toC. has t
• As students, we ________ study hard to make our country more beautiful and stronger.A．shouldB．mayC．c
• 下列哪项不属于生态系统的碳循环的环节（）A．大气中二氧化碳通过绿色植物的光合作用进入到植物体内B．动物通过直接或间接地摄食植物使碳进入到动物体内C．所有生物的呼吸作用和工-生物
• 下列属于消费者与生产者之间的关系的是（）A．青蛙捕食蝗虫B．兔子啃吃松蘑C．山羊吃树叶D．人类吃黑木耳-生物
• — Do you know the city of Ningbo well? — Of course I do. I've here for nearly 3 years. [ ]A. co
• My _______ name is Guo Ping. We are in the same school.A．friendB．friendsC．friend’sD．friendly-九年级英语
• --Listen! Someone is knocking at the door. Who _____it be?---It_____be Tom. He phoned to visit me th
• 绿色植物在生态系统中属于______，蜜蜂在生态系统中属于______，营腐生生活的细菌和真菌在生态系统中属于______．-生物
• — ___ he a cook? —Yes, he is. [ ]A. Is B. Are C. Does -七年级英语
• 任何一个生态系统都包括______成分和______成分．-生物
• 济南千佛山是著名的游览胜地．下面是小明在千佛山旅游时，所作的部分记录，你认为小明判断正确的一项是（）A．千佛山是一个生态系统，该系统能量的源头是太阳能B．山中的各种动物-生物
• — Sorry. I am late. — It doesn't matter. The meeting _____ for just several minutes [ ]A. has
• Mrs. King has ________ China for over 3 years. [ ]A. gone to B. been to C. come to D. been in -九年级英语
• -Listen! Is Mary playing the piano in the room?--No. It ________ be Mary. She has gone to Hong Kong.
• 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
• 维持生态平衡必不可少的生物是（）A．生产者和草食动物B．生产者和分解者C．肉食动物和分解者D．草食动物和肉食动物-生物
• – 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