The tour guide has made the route for the school trip. We don’t need to __ that. A. be worried about

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• — _____ you tired? — Yes, I _____. [ ]A. Do; do B. Did; do C. Are; am -八年级英语
• 假设某生态系统中有甲、乙、丙三种生物，他们的捕食关系如右图所示．那么该系统中属于生产者的是（）A．甲B．乙C．丙D．乙和丙-生物
• 在生态系统中，物质是循环的．生产者能把二氧化碳和水这些无机物制造成有机物，下列（）能把有机物再转变成二氧化碳和水等返回无机环境中．A．生产者B．消费者C．分解者D．以上都是-生物
• The talented boy _________ write lyrics when he was at the age of ten. A. may B. could C. must-九年级英语
• At last the boy was made and began to laugh.A．stop cryingB．to to stop to cryC．to stop cryingD．stop t
• Mr Johnson _______ a child at the start of the 1950s. [ ]A. is B. are C. was D. were -七年级英语
• 在生态系统的各种成分中，______能够把复杂的有机物分解成______归还到环境中被植物等生物再利用．-生物
• — How was the youth club last night, Mark? — It was great fun. You ______ come. [ ]A. must B. can C.
• 据观察，蚯蚓在土壤中以植物枯叶、朽根为食，你认为它在生态系统中应属于（）A．生产者B．分解者C．消费者D．生产者兼消费者-生物
• — What are you looking for, Michelle?— My cousin's MP3 player. It ______ right in here, and now
• He went into his room,the light and began to work.A．has turned onB．turned offC．turned onD．has turned
• —Would you like _______ or shall we go by bus?— I prefer _______,but we have to take a taxi, for tim
• 在生态系统中既属于生产者，又属于消费者和分解者的是（）A．植物B．动物C．微生物D．细菌-生物
• 生态系统具有一定的稳定性，下列关于生态系统的描述中，错误的是（）A．生态系统包括生物部分和非生物部分B．生态系统的营养结构是食物链和食物网C．太阳是食物链的组成部分D．生态-生物
• Both you and Igood teachers. [ ]A. are B. is C. amD. was -九年级英语
• 在自然界，生物之间的信息交流是普遍存在的．正是由于______、______、______的存在，使生物之间的联系错综复杂，生物与环境才成为统一的整体．-生物
• 自然界中的虎、豹等大型肉食动物，在种类和数量上均比其他动物少得多，造成这种现象的主要原因是（）A．大型肉食动物繁殖能力低B．它们在食物链中所处的营养级较高C．这些动物被人-生物
• --What do you think of the book you borrowed from the library yesterday?--I have no idea. I_________
• ––Are you _______ “Planting online vegetables”? ––No, I think it’s a waste of time. A．major in B．afr
• People who drink wine ______ to drive after May Day. A．don’t allowB．isn’t allowedC．mustn’t allowD．mu
• 一个生态系统，无论大小都是由（）A．生产者，消费者，分解者组成B．植物，动物，细菌，真菌组成C．生物部分和非生物部分组成D．阳光，空气，水组成-生物
• 如图为某生态系中部分食物网图．请回答：（1）图中绿色植物进行光合作用的场所是细胞中的______，绿色植物是生态系统中的______者；（2）在该生态系统中含能量最多的生物类群是___-生物
• 如图为三个处于不同环境的生态瓶（将A，B瓶置于有光条件下，C瓶用不透光的盒子罩住）．请分析回答下列问题：（1）探究“光对生态系统的稳定性是否有影响”这个问题，应选择______瓶与-生物
• —Steve is good at writing short stories. — So he is. But he writes _______ than us. So he can’t get
• Do you know any singers who ____ good at writing their own songs? [ ]A. is B. does C. are D. do -九年级
• —Hey! Don’t you remember me?—Wow! Mary? You _______ curly hair. But now you have straight hair.A. us
• 蘑菇在生态系统中属于（）A．消费者B．分解者C．生产者D．制造者-生物
• 如图是某生态环境的示意图，请据图回答下列问题：（1）此生态系统中生物所需的能量根本来源是______．（2）在此生态系统中最基本、最关键的生物组成成分是______．（3）图中所示的细菌-生物
• The light is on in Mr. Green’s room. He _______ be at home.A．mustB．canC．mustn’tD．can’t-九年级英语
• －Mike, I can’t stop playing computer games.－For your eyes, I am afraid you ______.A．have toB．mayC．wo
• 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
• There ______ a number of people in the airport. The number of people who travel by plane ______ larg
• 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
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• 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