生态系统中生产者、消费者、分解者之间的关系是（）A．生产者依赖于消费者、消费者依赖于分解者B．消费者很依赖生产者、生产者依赖于分解者C．分解者依赖于生产者和消费者，消费者-生物

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• 如图表示某生态系统组成示意图，以下说法正确的是（）A．从图中可以看出一个完整的生态系统包括生产者、消费者和分解者B．如果此生态系统受到了有毒物质DDT的污染，那么植物体内-生物
• — _good time we had at the party last night!— Yes. It was _____ exciting party that I would never fo
• --Whose backpack is this? ---It be Jim’s. Look, his student’s card is in it.A．mustB．canC．mustn’tD．ca
• The line of people outside the house ____ endless on that morning of the day. [ ]A. isB. areC. wasD.
• I love the dress.It’s ________.A．out of styleB．in styleC．inthe styleD．out style-八年级英语
• — I think Mr. Zhang may be in his office.— No, he _____ be there. I saw him ____ there just now.A．ca
• —Whose schoolbag is this?—It ___________ be Mary’s. It has her name on it.A．canB．mayC．willD．must-九年级
• 单项选择。Jenny, Danny and I ______ from Canada. [ ]A. amB. is C. are D. comes -七年级英语
• 小科同学走近一鱼塘边的某一位置时，鱼塘中的鲤鱼便会成群地向他游来，并逐渐向他聚集，如图所示．（1）对此现象的解释最合理的是______．A．鲤鱼本身具有亲近人的特性B．鲤鱼本身-生物
• — Good morning. I've got an appointment with Ms King in her office.— Morning. You _______be Mr
• ______ your parents strict ______ you in your study?[ ]A．Is, with B．Are, in C．Is, in D．Are, with -九年
• 油菜是一种我们比较常见的油料农作物，农民铜多种植油菜收获油菜籽，油菜籽经过加工可以制成菜油．请回答：（1）油菜是生态系统组成成分中的______．（2）油菜进行光合作用过程中，-生物
• —Must I return the hook tomorrow morning? —No, you _ .You can keep it longer.A．mustn'tB．can
• Here ______ some parts of plants we eat. [ ]A. be B. is C. are D. am -八年级英语
• You _____ lose your way if you walk alone in the mountains at night.A．mayB．needC．shouldD．ought to-九年
• 单项选择。Maths ______ easy to learn well. [ ]A. is B. areC. am D. be -七年级英语
• — May I do the homework tomorrow?一 No, you______. You should hand in before class tomorrow. A. mustn
• Where my glasses______? I can't find them. A. is B. are C. was-九年级英语
• 单项选择。Yesterday I ______ tired but happy. [ ]A. am B. was C. is D. are -七年级英语
• 如图是某地生态系统图，请据图回答：（1）该生态系统中生产者是______．（2）该生态系统中细菌、真菌、蚯蚓属于______．（3）该生态系统中有多条食物链，在“草→昆虫→食虫鸟→鹰”这条食-生物
• 一个生态系统无论大小，都是由______和______组成的．-生物
• －Are people around you used to _______things online?－Yes. It’s much easier, and also cheaper.A．order
• Lucy _____ born _____ London _____ May 1, 1986 [ ]A. is; in; onB. was; in; on C. was; in; in D. is;
• Mom bought ____ oranges for me, but I’d like to drink some ________. A. many; oranges B. much; orang
• —Miss Li, must we hand in our homework right now?—No, you ____.You can hand it in tomorrow.A．don’tB．
• It rained heavily, so we _______ stay at home watching TV or surfing the Internet all day. A. could
• Not only I but also he helpful to others. [ ]A. am B. is C. are D. be -九年级英语
• 下列有关生态系统的叙述中，正确的是（）A．生态系统的组成成分包括生产者、消费者和分解者B．生态系统中各利生物的数量和所占的比例是不变的C．生态系统中的物质和能量是沿着食物-生物
• —How often do I need to feed the birds?—They ________ food every day，or they will be hungry.A．must g
• 如图是生态系统的能量流动示意图．（1）上图说明，输入改生态系统的能量，来自于图中______的______作用．（2）在生态系统中，能量是沿着______依次流动的．当能量在逐级传递时，由-生物
• 下列生物中，属于生产者的是（）A．牛B．蘑菇C．人D．向日葵-生物
• 选择填空。—How many bookcases ______ there in your study?— There ______ one. [ ]A. are, is B. is, are C.
• You _______have a wrong number. There’s no Mr Johnson here.A．need B．wouldC．mustD．can-八年级英语
• — everybody here yesterday? —No, Linda wasn't here. [ ]A. Do B. Does C. Is D. Was -八年级英语
• I ______ able to sing any song but this one. [ ]A. may B. can C. am D. would -九年级英语
• 单项选择。What ______ your favourite food? [ ]A．is B．are C．be D．am -七年级英语
• — How is your English study?Not bad. But I_______ learning English grammar.A．am interested in B．am g
• The number of the women teachers ______ 80 last term in our school. [ ]A. isB. are C. was D. were -九
• 鲁迅先生在《从百草园到三味书屋》中写到：“不必说碧绿的菜畦，光滑的石井栏，高大的皂荚树，紫红的桑椹；也不必说鸣蝉在树叶里长吟，肥胖的黄蜂伏在菜花上，轻捷的叫天子（云雀-生物
• Her sister ____ a taxi driver. Now she works for a charity.A．isB．were used to beingC．is used to bein
• 如图是某生态系统简图，请据图答题：（1）在这个生态系统中，阳光、空气、水等属于______因素．（2）图中陆地部分的食物网可画出几条食物链：______（3）如果食虫鸟的数量大量减少，对-生物
• 选择填空。—Hello! I ______ Jim. What's your name?— My name ______ Sally. [ ]A. am, is B. are, am C.
• I didn't know you ______ here. [ ]A. are B. will be C. have been D. were -九年级英语
• The magazine___________ be Lily's, for we can find her name on the cover.A．mayB．might C．couldD．
• They think wearing their own clothes _______ good for their studies. [ ]A．areB．do C．does D．is -九年级英语
• 生物圈中到处都有绿色植物．地球上包括我们人类的其他生物都离不开绿色植物．请就所学的知识回答：（1）绿色植物是生态系统中的______．（2）植物体的生长发育是从______开始的．（3）绿-生物
• They _____ England and they will be back next week.A．have gone toB．have been toC．have gone inD．has b
• 某草原生态系统中各成分之间的关系如图所示．请回答：（1）图中的植物是生态系统中的______者，动物是生态系统中的______者．（2）生态系统通过食物链和食物网进行着能量______和物-生物
• 根据下面的图示，判断说法正确的一组是（）A．图一所示图“大气”的成分是氧气，生态系统中的能量流动方向是动物到植物、微生物到动物、微生物到植物B．图二表示用显微镜观察洋葱鳞-生物
• 硝化细菌能利用化学能将无机物转变成有机物，满足自身对营养物质的需要，这类细菌在生态系统中属于（）A．生产者B．消费者C．分解者D．消费者和分解者-生物