如图表示生态系统中四种成分之间的关系，请据图回答有关问题：（1）甲代表______，乙代表______．（2）图中的丁代表______．（3）丙在自然界物质循环中的重要作用是______．-七年级生物

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• One of my best friends ______ going to ______ a model when she grows up.[ ]A. are, be B. is , become
• – Could I use your mobile phone? I have to call my mom for the coming class meeting. --Yes, of cours
• This toy Mickey Mouse _______be Amy's. She's the only kid at the picnic.A．must B．can C．nee
• A: You_____ Tom. What_____ her name?B: I don't know.[ ]A. is, are B. am, are C. are, is D. is,
• I think Tom ________ to finish the difficult work in an hour or two. [ ]A. can't B. will C. is
• This toy Mickey Mouse _______be Amy's. she's the only kid at the picnic.A．mustB．canC．needD
• 细菌、真菌是生态系统中的______，动物是生态系统中的______．-七年级生物
• 根据生物与环境的知识回答下列问题：（1）在一定的地域内，生物与环境所形成的统一的整体叫______．（2）在生态系统中，动物是______者，植物是______者，它们之间吃与被吃的关系就-生物
• 北美的凯巴森林主要由松树、冷杉和云杉等植物构成，森林的底层还生长着多种草本植物．树上生活着快乐的小松鼠，以采集果实为生．森林中大约有4000多只黑尾鹿吃树叶或草本植物．-七年级生物
• — You went to town last month, What do you think of it?— Terrible . I _____ go there _____.A．Will; a
• Food safety is important. Rules____ to stop people from food pollution.A．must make B．must be madeC．c
• Youkeep quiet in the library because everyone is reading here.A．mayB． shouldC．mustn’tD．needn’t-八年级英语
• The total number of the students in our class_____52.[ ]A. am B. is C. are D. be-七年级英语
• You _____ in your composition today. You can hand it in tomorrow morning.A．need to handB．needn’t to
• The magazine ____ be Lily's. Look, her name is on its cover. [ ]A. may B. mightC. could D. must
• -----Whose T-shirt is this?----- It _______ be John’s. It’s _______ small for him.A．can’t; much tooB
• — Let’s play computer.— That ________ good.[ ]A. listen B. soundsC. sound-八年级英语
• What ____ you like ____ breakfast?[ ]A. do; to B. would; to C. would; forD. do; doing -七年级英语
• --“Where is Tom?”--“He hasn’t come to school today, I think he ______be ill.”A．has toB．shouldC．mayD．
• 如果这是一个生态系统，从生态系统的组成来看，还缺少（）A．非生物成份B．生产者C．消费者D．分解者-七年级生物
• 如图所示为一个池塘中的水草、浮萍、水绵、鱼、是等生物．（1）若构成一个完整的生态系统，除上述生物外，还应添加的成分是______和______．（2）鱼进行生命活动所需的能量最终来自-七年级生物
• 你和家人被困在1个遥远的岛上，只有1头奶牛和一大堆用来喂奶牛的麦子．为了获得最大的能量和存活最长的时间，你应当（）A．用麦子喂奶牛，然后喝牛奶B．先吃奶牛，然后吃麦子C．用-生物
• 如图是草原生态系统中的部分生物，以及不同生物之间存在的食物关系．据图回答以下问题．（1）生态系统的成分包括非生物部分和生物部分，生物部分包括生产者、消费者和______．因此-生物
• There is going to _____ a football match tomorrow.[ ]A. have B. has C. be D. is-七年级英语
• —What do you think people can do for their aged parents?—They_________ do anything except to be with
• Rose, you leave your school things on the floor like this. Keep your room clean and tidy.A．may notB．
• 按要求改写句子1. Her ring is red.(就画线部分提问)What ______ is ____________?2. Here are some oranges.(改为单数形式)Here
• The doctor said he _______ an operation yet.A．needB．needn’tC．needed notD．didn’t need-九年级英语
• — Kate, _____ you dance the disco? — Yes, I can. [ ]A. may B. can C. must D. need -九年级英语
• 小明用一个1000毫升的无色玻璃瓶、1个软木塞、石蜡、4棵水生植物、2条小鱼、4只田螺、放置几天的自来水、沙砾等材料制作了一个生态瓶．妙在小鱼、田螺、水生植物都能生活相当-七年级生物
• 在上文中提到的几种生物中，数量最多的是（）A．蔬菜及皂荚树B．黄蜂C．鸣蝉D．叫天子-七年级生物
• 生物圈中的动物必须直接或间接地以消耗绿色植物合成的______来维持生活，因此，动物是生物圈中的______．-生物
• 如图是某一温带草原生态系统的食物网，请你试一试据图回答下列问题：（1）图中所有动物属于生态系统的______．（2）作为一个完整的生态系统，图中未画出生态系统的分解者和______部-生物
• 动词填空，选择方框中的动词并用其适当的形式填入相应的句子中。 take, play, get, be, help1. Everyone in our class _____here. 2. Let m
• You look quite tired. You’d better _____a good rest.A．stop to haveB．stop having C．to stop to haveD．t
• —Listen！Helen is singing in the next room.—It _____be Helen .She has gone to Beijing.A．shouldB．mustn
• 句型转换。1. He is a doctor from England. (改为否定句)Hea doctor from England.2. She has a cup of milk every m
• —_____ I finish the book this week?—No, you ____ . You ____ return it to me the week after nextA．Nee
• —There is someone in the classroom.—It ________ be Lucy. She always gets to school early.[ ]A. can B
• 食物的最终来源______，能量的最终来源______，能量的直接来源______，主要供能物质______．-七年级生物
• 下列食物链正确是（）A．草→蚱蜢→食虫鸟→蛇→鹰B．蚱蜢→草→食草子的鸟→鹰→狐C．狐→鹰→食虫鸟→蚱蜢→草D．草→蚱蜢→食虫鸟→鹰→蛇-七年级生物
• 在农田生态系统中，最主要的生物成分及其在生态系统中组成成分分别是（）A．杂草、生产者B．害虫、消费者C．人、管理者D．农作物，生产者-七年级生物
• The boy ______ his father very much.[ ]A. look like B. looks likeC. is likesD. is liking-七年级英语
• — Mum, my friends are waiting for me outside. May I go out to play with them?— Yes, you , but be car
• ----Must I hand in our homework today?--- No, you ______.A．mustn’tB．needn’tC．can’tD．shouldn’t-八年级英语
• --- There is someone at the door. Who ______ it be? Is it the postman?--- No, it ________ be him. It
• 句型转换1. He's my friend.(改为一般疑问句)______ he_____friend?2. Those are my shoes.(改为单数句)_____ _____my
• 一个天然湖泊生态系统中，肉食性鱼总比草食性鱼的数量少得多．这是由于（）A．湖泊中鱼的密度太大B．湖泊中氧气不足C．水鸟叼走肉食性鱼苗过多D．能量在食物链中逐级递减-生物
• ---Can Bill play ping-pong?---_____. He can play it very well．A. Yes，he can B．Yes, he can’t C．No, he
• —you spell “pencil”?—Yes, P-E-N-C-I-L, pencil.A. Are B. How do C. Can-七年级英语