There are a lot _____ students on the playground. A. of B. in C. by-九年级英语

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• There ______ little water in the river.A．beB．amC．isD．are-九年级英语
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• 若某个草原生态系统中的甲乙丙丁四种生物构成一条食物链，在某一时间（生态系统处于生态平衡）分别测得某种群数量如右图所示．（1）在四种生物中，最有可能是生产者的是______；这-生物
• In the past five years, Jim _______ France three times. [ ]A. went B. has gone to C. has been to -九年
• Complete sentences with "is, are, was, were". 1. We told to be ready at ten o'clock.
• The population of my hometown200.[ ]A. is B. are C. am D. do-七年级英语
• 用所给词的适当形式填空。1. ________ (be) his friends here today? 2. She is friendly (友好的) and ________ (help). 3
• ----Dad, the bread is not enough. I am still hungry.I have something more? ----But there’s nothing i
• _Can you write a letter in English? _No, I______.I know only a little English.A．can’tB．needn’tC．may
• 动物在自然界中扮演的角色是（）A．生产者B．消费者C．分解者D．破坏者-生物
• 下图为一个池塘的生态系统，池塘内有水草、浮萍、水绵、鱼、虾等生物．（1）在此生态系统中，生产者是______（3种），消费者是______（2种）．在该生态系统中，没有画出的生物成分是-生物
• They _______ friends since they met in Shanghai. [ ]A．had got B．have became C．have been D．have turne
• Movie programs often CCTV-6. [ ]A. is; in B. are; into C. is; at D. are; on -九年级英语
• We sure he is innocent (无辜的). [ ]A. are; that B. be; / C. /; for D. are; what -八年级英语
• —Where have you , Tim?— I've been to Mount Huang. [ ]A. gone B. been C. been to -九年级英语
• — _______ Amy late for school? —Never. [ ]A. How long is B. How often does  C. How many times does
• 下面的说法，正确的是（）A．蘑菇是植物，属于生产者B．有机物的最终来源是光合作用C．生产者、消费者、分解者构成生态系统D．水稻在灌浆期如果连日阴雨，就会减产，是水分因素的影-生物
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• A student in my class said to me, " If I our math teacher, Imake math learningeasier and more i
• 人类是生态系统中的成员，人类在生态系统扮演的角色是（）A．分解者B．生产者C．消费者D．生产者和消费者-生物
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• 生物圈是地球上所有生物的家，生物在生物圈中生存、繁衍，而且相互间发生复杂的关系，对此请分析回答下列问题：（1）生物不仅能适应环境，也能影响环境．请写出生物影响环境的一-生物
• Four years, from the 2004 Olympics to the 2008 Olympics, _____ a long time to wait for Lin Dan. [ ]A
• Many beautiful buildings ______ in our city last year. [ ]A. are built B. were built C. is built D.
• 微生物对一个生态系统来说是十分重要的，这是因为（）A．它能直接或间接的以植物为食B．它能把动植物的遗体和排泄物分解为无机物C．它能制造有机物D．它能吸收二氧化碳，放出氧气-生物
• How kind you are! You always do what you can_________me.A．helpB．helpingC．to helpD．helps-九年级英语
• Every year lots of trees _______ to make our country more beautiful.[ ]A．is planted B．was planted C．
• —scientific attitude is needed in developing our city.— I agree with you. In this way, we can makemi
• 城市生态系统中的生产者是（）A．工厂里的工人B．城市中的草坪C．城市中的楼房D．市民的宠物-生物
• 下列对生态农业的叙述，不正确的是[]A．有助于保护生态系统B．使能量得到循环利用C．使资源得到持续利用D．能提高生态农业系统中的生产率-八年级生物
• —How long have Mr and Mrs White ________? —For more than twenty years. [ ]A. married B. had married
• 改错题。1. How is Jane yesterday? _____________________ 2. He go to school by bus last week. ___________
• your father at work the day yesterday (前天)?[ ]A. Was; before B. Is; beforeC. Was; after D. Is; afte
• 从物质循环的观点来看，动物体中碳元素的最终来源是（）A．糖类中含有的碳B．大气中的二氧化碳C．蛋白质中含有的碳D．岩石中的碳-生物
• Harriet is lost and her parents are really________her.A.interested in B. afraid of C. busy with d. w
• —Could you tell me _______? —He is in the library. [ ]A. where Simon was B. where is Simon C. where
• 如图所示为以草原生态系统中狼、草和兔的数量关系，请据图回答问题．（1）A代表的生物是______，B代表的生物是______，C代表的生物是______．（2）一般情况下，三种生物的数量总维-生物
• 如图所示为某农田中的生物与其生活的环境，请回答下列问题．（1）春季，农民通过播种育秧种植水稻，水稻的生殖类型属于______生殖．（2）该农田的动物中，生殖过程属于体内受精的是-生物
• The twins in Dalian last year. They here now. [ ]A. are; wereB. were; are C. was; are D. were; was -
• 生物因素是指（）A．所有的环境因素B．环境中影响生物生活的因素C．影响某种生物生活的其他生物D．影响某种生物生活的一切因素-生物
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• The Spring Festivalin January or February.A．celebrates B．is celebratedC．celebrated D．was celebrated-
• The work is too hard for him. He__________ finish it on time.A．can'tB．mustn'tC．shouldn
• ______里有微生物生活需要的各种营养物质，是微生物的主要活动场所．______微生物能将复杂的动物尸体、粪便和枯枝败叶等含的有机物加以分解，把产生的简单无机物归还到非生物-生物
• My father ill yesterday. [ ]A. isn't B. aren'tC. wasn't D. weren't-七年级英语
• 当今许多城市建筑出现“屋顶绿化”，它一般分为屋顶花园和植被屋顶两大类．屋顶花园的植物种类丰富，能够形成一定层次的植物群落，观赏性和稳定性高，但对屋顶的承载能力和土壤-生物
• 一Shall we meet at the station at 8 am?—In fact, we _______. The train _______ until l0 a.m.A．mustn’t