生态系统中最基本、最关键的生物组成成分是（）A．空气B．分解者C．消费者D．生产者-生物

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• 下面关于生态系统的说法中，错误的是（）A．生态系统包括生物部分和非生物部分B．生态系统中的有毒物质是沿着食物链不断积累的C．生物圈是一个统一的整体，是地球上最大的生态系统-生物
• It _____ that Yu Mei has changed a lot. [ ]A. seem B. seems C. look D seemed-八年级英语
• A ruler and a pen ________ in the Lost and Found. [ ]A. is B. are C. has D. have -七年级英语
• 微生物或少数动物能把植物遗体或遗物中所含的______分解为______，所以称为分解者．-生物
• ----- Can you ride a horse? --------No, I ________.A．needn’tB．may notC．can’tD．mustn’t-九年级英语
• Susan’s parents bought a large house with a swimming pool. It ______be very expensive.A．canB．mustC．m
• —Where is Tom?—He hasn't come to school today.I think hebe ill.[ ]A. has toB. shouldC. mayD. ne
• Look! Grandma with her grandsonsplaying happily in the garden now. [ ]A. are B. is C. was D. were -八
• Today is Wednesday. He _______ be at home. He _____ be at school.A．can’t; canB．can’t; mustC．mustn’t;
• 组成生态系统的成分是（）A．全部的植物、动物和微生物B．全部的生产者、消费者和分解者C．生产者、消费者、分解者以及非生物的物质和能量D．全部的生产者、消费者、分解者和环境中-生物
• 如图是草原生态系的食物网，请据图回答．（l）一个完整的草原生态系统，除了图中所示的各种生物外，还应包括______．（2）此生态系统中的生产者是______，它与消费者之间形成_____-生物
• 用所给词的适当形式填空。 1. Could you(help) me with my lessons? 2. Peter do the(dish) in a fast food restaurant.
• It _____ that he has been ill for a long time.[ ]A. seems B. looks C. looks as if D. seems as if-八年级
• 如图是生态系统中物质循环示意图，请你将其中缺少的部分填完整．-生物
• Your idea ________ good. [ ]A. see B. sound C. hears D. sounds -七年级英语
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• 在一个草原生态系统中，生产者是（）A．鼠B．草C．兔D．鹰-生物
• 上右图是一个森林生态系统中的各种生物，请观察：（1）图中的生产者是______，消费者有______．（2）生产者和消费者之间的关系，主要是______与______的关系，这样它们之间就形成了-生物
• 动物不能自己制造有机物，它们直接或间接的以______为食，因而叫做______．-生物
• 一 ______ Mimi cute? 一 Yes, I think so. [ ]A. Doesn't B. Don't C. Aren't D. Isn't
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• -- Who’s singing in the next room?--- It ____ be her . She went to New York yesterday eveningA．can’t
• 池塘生态系统中有鱼类、浮游动物、绿色水生植物、真菌等生物，则该生态系统中的物质和能量的流动是从哪类生物开始的（）A．绿色水生植物B．浮游动物C．鱼类D．真菌-生物
• 最简单的生态系统，必须具有的生物成分是（）A．动物和植物B．非生物的物质和能量及生产者C．生产者和分解者D．生产者、分解者、消费者-生物
• 如图是草原生态系统中的主要成员及食物关系，请据图回答下列问题：（1）图中所示的是生态系统的______部分．在生态系统中，植物是______，动物是______，细菌和真菌是______．（2）-生物
• —Mr. Wang __________ be in the office. The light is still on.—No, he __________ be. Because he phone
• -__________ I do my homework now?-No, you __________.[ ]A. Can; needn'tB. May; needn'tC. C
• The cake _____ good. I can't wait to eat it. [ ]A. feels B. sounds C. becomes D. smells -九年级英语
• --Who is making much noise?---It ____ be Timmy. He is sleeping now.A．can’t B．may notC．mustn’t D．coul
• We hope that as many people as possible ______ join us for the charity show tomorrow.A．needB．canC．mu
• 在一个成分复杂的生态系统中，对保持生态平衡起决定作用的是（）A．非生物的物质和能量B．生产者C．消费者D．分解者-生物
• Don't go out to play. You_______finish your homework first.[ ]A. mustB.haveC.hadD.have to-八年级英语
• —Can you tell me what to wear at the party?—If I you, I the blue jeans.A．am; will wearB．was, will we
• –Look at that girl! Is it Susan? --No, it _______ be her. She went to her hometown just now.A．mustn’
• 分解者是生态系统中的重要组成成分，下列哪种生物不属于分解者（）A．灵芝B．枯草杆菌C．青蛙D．蘑菇-生物
• Put a bit of sugar in the coffee, and it will ______ better. [ ]A. sound B. taste C. look D. make -九
• I'msorrytohavekeptyouwaitinglong.Nevermind,I_______hereforonlyafewminutes.[ ]A. havebeen B. hav
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• Li Lei _____ Hubei. He is my good friend.[ ]A. come from B. is come from C. is from D. from -七年级英语
• 某一生态系统中有绿色植物、细菌、真菌、鼠、蛇、鹰，其中属于消费者的是（）A．细菌、真菌B．绿色植物C．鹰、细菌D．鼠、蛇、鹰-生物
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• （1）草A、消费者：（2）昆虫B、分解者：（3）细菌、真菌C、生产者：（4）田里的水稻和杂草D、生长（5）老虎吃野猪E、竞争关系（6）植物开花结果F、捕食关系（7）小虎长成大老虎G、繁殖．-生物
• 如图是草原生态系统的食物网示意图，据图回答：（1）从生态系统的成分来看，兔属于______（填“生产者”、“消费者”或“分解者”）．（2）“草→鼠→鹰”这条食物链中包括了3个环节；补充食物-生物
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• — What color _____Li Ming's clothes?— _____ white and black. [ ]A. does; It's B. do; We�