在一条食物链中，第二营养级的能量至多有多少流入到第五营养级（）A．15B．1125C．1100D．11000-生物

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• —Can I go to the park, Mum?—Certainly. But you ______ be back by six o’clock. A．can B．may C．might D．
• 分析生态系统简图，回答有关问题：（1）在这个生态系统中，非生物因素出了泥土外，还有温度、______、水和就空气等．（2）该生态系统中，分解者是______．（3）该生态系统中，最长的一-生物
• 连线题A组：A、猫头鹰----1、分解者B、蘑菇----2、生产者C、菠菜----3、消费者B组：A、老虎吃野猪----1、合作关系B、许多蜜蜂在酿蜜----2、竞争关系C、田里的水稻与杂草----3
• 用am, is, are填空。1. Alice _____ my sister.2. I_____ 12 years old.3. You_____welcome.4.He and I_____in
• You are supposed to arrive on time. [ ]A. should B. must C. have to D. need -九年级英语
• — Must we finish our homework today?— No, you ________.A．can’t B．mustn’t C．don’t have to-八年级英语
• —What do you use computers to do? —They are useful.For example, they can_ sending e-mail. [ ]A. use
• This case is too heavy. Could you _____ me a favor?A．to do B．doing C．do-八年级英语
• Mr Blackbe at home because she called me from England just now.A．mustn'tB．isn't able toC．c
• —Where are Lucy and Lily?—Oh , the two girls must _______ a game in the garden now.A．playB．are playi
• –Must I finish my work in an hour?-No, you _______. A. mustn’t B. can’t C. needn’t-九年级英语
• 如图甲为自然生态系统的生态金字塔，乙为城市生态系统（属于人工生态系统）的生态金字塔．以下解释不符合客观事实的是（）A．甲图表示能量流动的途径是绿色植物→食草动物→食肉动物-生物
• 在一个生态系统中，属于生产者的是（）A．动物B．腐生细菌C．植物D．真菌-生物
• 目前在某些城市时兴一种水晶球样的生态球（如图）作为家庭摆设．该球密封，内装有水、2～3条小鱼，底部有泥沙，并生长着一些水藻．妙在小鱼、水藻都是活的．分析回答下列问题：（1）这-生物
• —_____ the twins wearing the same clothes? [ ]A. Is B. Are C. DoD. Does-七年级英语
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• -______ I do the laundry first?-No,you _____. You can do your homework first.A．Must;mustn’tB．Can;mus
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• —Can I go out and play football for a while, Mum? —I'm afraid you____.Work comes first. [ ]A.ca
• — I have a toothache. — You see a dentist. [ ]A. will B. can C. should D. could -八年级英语
• —How beautiful our hometown is! —Yes, trees and flowers____everywhere.[ ]A. can be seenB.can seeC.be
• 一位同学将鱼、田螺和一些水生植物一起放在盛有水的密封的广口瓶里（如图），并在瓶的近旁放一盏电灯．分析回答：（1）在广口瓶生态系统中，生物因素和非生物因素各有哪些？______．-生物
• ---There _____ anybody in the room. --- Why do you say so? --- Because the door is locked.A．must not
• Thomas, please don’t shout loudly. The others _________ hear very well.A．can’tB．mustn’tC．shouldn’tD．
• 某同学把调查一农田生态系统作为研究性课题．把认真考察了西瓜从播种到收获的全过程，下面是他的部分调查内容及感想和疑问，请分析回答（1）农民在播种前，先要浸种、催芽．1000-生物
• －Must I finish my composition (作文) right now?－No, you _______.You can hand it in tomorrow.A．can’tB．m
• Whereyour cousin? [ ]A.does,from B.is,come from C.is,from D.are,from-七年级英语
• 如图表示的是某生态系统的部分组成，请据图回答：（1）图中太阳光、空气属于生态系统的______因素．（2）图中属于生态系统中生产者的是______．（3）图中属于分解者的是______．（4）螳螂-生
• 单句改错(每句均有一处错误)。1. My uncle has become a Party member for ten years.2. Have you gone to the Great Wal
• John, you play with the knife, or you hurt yourself.A．won’t; can’tB．mustn’t; mayC．shouldn’t; must D．
• 如图是某一农田生态系统示意图，根据图回答下列问题：（1）该生态系统中，非生物成分除了水、空气、温度外，还应该有______．（2）图中禾谷类植物通过光合作用合成有机物，为其它生-生物
• —_____ I have a ticket, please? —Sorry, sir. All the tickets were sold out ten minutes ago.[ ]A. May
• ---I argued with my best friend . what advice do you have for me? ---Well, you _________ say you are
• —______ your twin brother's name Nick? — Yes, ______ is. [ ]A. Are; he B. Is; he C. Are; it D.
• 关于植物在生物圈中的作用，下列表述不正确的是（）A．参与生物圈的水循环B．作为分解者参与生物圈的物质循环C．维持生物圈中的碳-氧平衡D．为生物圈中的其它生物提供基本的食物来-生物
• 在植物→昆虫→蛙→蛇这条食物链中，若蛇增加1g体重，至少要消耗植物（）A．1000gB．500gC．250gD．125g-生物
• __________ your new pen pal like?[ ]A. WhatB. What'sC. How isD. How does-八年级英语
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• The room_____very quiet. The students are playing outside.[ ]A. sound B. sounds C. sounded D. soundi
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• --- ____I take the newspaper to the classroom? ---No, you mustn’t. You ______ read it only here.A．Mu
• —What does your brother do?—He _____ a teacher[ ]A. do B. doesC. worksD. is-七年级英语
• ---Whose notebook is this? --- It ________ belong to Lucy. Look, her name is in it.A．mustB．canC．can’
• 生态系统由______和______两部分组成，前者由生产者、______和分解者组成；后者由阳光、______、______等部分组成．-生物
• 生物圈中不可缺少的生物是（）A．绿色植物、动物B．绿色植物、细菌和真菌C．绿色植物、人类D．动物、细菌和真菌-生物
• ---Can I tell Peter about the news?---No, I don’t want anyone else to know it. You ______ keep it to
• 生态系统营养结构的基础是（）A．食物链和食物网B．生产者和分解者C．物质和能量D．光合作用和呼吸作用-生物
• 用am, is, are填空1. I _____ a teacher. 2. He _____ sad. 3. She _____happy.4. My eyes ____ black.5. Your