You ______ go and ask Meimai.She _____ know the answer. [ ]A. must, canB. must, mayC. need, mayD. ca

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• 生态系统的结构越复杂，能量流动和物质循环的途径就越______，其抵抗外力影响的能力就越______．-生物
• Where are my keys? I _____ find them. [ ]A. aren't B. can't C. am not D. don't-七年级英语
• 某草原生态系统中生活着多种生物，其中有以植物各器官为食的羊、鼠和昆虫；有吃羊的狼；有吃昆虫的鸟；有以鼠为食的蛇；还有以鼠、蛇和鸟为食的鹰．根据上述信息回答下列问题-生物
• 在一个由草、兔、鼠、鹰组成的食物网中，正常情况下，数量最多的生物是（）A．草B．兔C．鼠D．鹰-生物
• —Mum, canI wear my jeans to school?—No, you _____ wear your school uniform.That's the school ru
• —_________ I borrow your pencil, please? —Sure. Here you are.[ ]A. NeedB. MustC. Can D. Have to-九年级英
• — you play the piano?—No. But I can play the guitar.[ ]A. Can B. May C. Must D. Should-九年级英语
• Everyone _____ fight against pollution.[ ]A. may B. should C. mustn't D. needn't-九年级英语
• ______ I do my homework first?No, you ______ do it after supper.[ ]A. Must, can B. Can,are C. Must,
• Look! The light in the room is still on. Mr. Liuat work.[ ]A. mustB. can't beC. must beD. have
• —Xiao Ming. _____ you recite the dialogue?—I think I can. Let me try. [ ]A. Do B. MayC. Must D. Can
• 动物在生物圈中属于（）A．自养生物、生产者B．自养生物、消费者C．异养生物、生产者D．异养生物、消费者-生物
• 下列有关某湖泊生态系统描述正确的是（）A．该生态系统中，草、鱼、微生物等是生物部分，水、阳光、土壤、二氧化碳、有毒物质，绿藻是非物部分B．该生态系统中，小草→小鱼→大鱼→-生物
• He can ______ the book to your sister.[ ]A. takes B. takeC. brings D. bring-七年级英语
• 如图为生态系统碳循环示意图，①、②、③代表的生物成分依次是（）A．生产者、消费者、分解者B．分解者、生产者、消费者C．消费者、生产者、分解者D．生产者、分解者、消费者-生物
• —Must I finish the work before five o'clock?—No, you_____.[ ]A. needn't B. mustn't C.
• -___________ I come in?-Sure. Come in, please.[ ]A. WillB. MayC. MustD. Need-九年级英语
• —Our class won the table tennis match. —Congratulations! You______proud of it.[ ]A. can be B. may be
• 在生态系统的分解者中，对生态系统物质循环起着不可替代作用的微生物是（）A．腐生性微生物B．寄生性微生物C．蓝藻D．硝化细菌-生物
• — _______ I watch TV? —Yes, you can watch the football game after you do your homework. [ ]A. May B.
• Can you see the book ?Yes , I__________.[ ]A. amB. doC. can-七年级英语
• 下列在生物圈中属于生产者的是（）A．牛B．水稻C．鸭D．猪-生物
• —Look at that man. He ________ Mr. Wang.—No. He ________ Mr. Wang. He has gone to Beijing. [ ]A. mus
• Cars, buses and bikes ______ stop when the traffic light is red. [ ]A. mustB. can C. may D. need-八年级
• —What are you going to eat supper?—I ____ have dumplings. [ ]A. may B. must C. need to D. can-八年级英语
• 请阅读下列信息并回答问题：“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）忽然从草间直-生物
• 一个完整的生态系统，其组成成分包括（）A．食物链和食物网B．生产者、消费者和分解者C．阳光、空气和水等D．生物部分和非生物部分-生物
• Kate has a headache and she_____see a doctor. [ ]A. canB. should C. could D. shall-八年级英语
• My mother ______ make rice dumplings, she'll teach me how to do it. [ ]A. mustB. needC. shouldD
• —______ I ask you a question, Mr Wu?—Yes, of course. [ ]A. MayB. CanC. DoD. Will-七年级英语
• 放置在黑暗处的下述鱼缸中的鱼（鱼、缸大小均相同）最先死去的是（）A．一缸清水2条鱼B．一缸清水2条鱼和一部分水藻C．一缸清水10条鱼D．一缸清水10条鱼和一部分水藻-生物
• —I have your name?—Sure .[ ]A. May B. Am C.Do -七年级英语
• 下列微生物中，属于生态系统中生产者的是（）A．蓝藻B．肺炎双球菌C．枯草杆菌D．蘑菇-生物
• 下列生物中属于消费者的是（）A．草B．食虫鸟C．霉菌D．桃树-生物
• 如图是草原生态系统各成分的关系示意图，请据图回答问题：（1）在这个生态系统中，生产者是______，消费者是______，细菌和真菌作为______，在自然界中起到分解动植物遗体，参与-生物
• 实验中学生物兴趣小组对某小河中几种不同生物消化道内的食物进行分析，并请环保专家对这5种生物体内的主要污染物含量进行了测定．其结果见下表：生物种类消化道内食物千克体重-生物
• —Must I hand in my homework today?—No, you _____. Tomorrow is OK. [ ]A. mustn'tB. wouldn't
• ---__________ he speak English? ---No, he can’t.[ ]A. DoesB. IsC. Can-七年级英语
• —_________ you please tell me your name?—Sure. My name is Jeff.[ ]A. DoB. CouldC. CanD. Are-七年级英语
• —What _______ we do in summer?— We _______ swim in the river.[ ]A. am, do B. do, do C. can, can D. c
• 如图为温带草原生态系统示意图，据图回答：（1）食物网中有______条食物链，其中最长的一条是：______（用文字和箭头表示）．（2）该生态糸统中的兔与草、蛇与鼠的关系是______关系，-生物
• —Who is making much noise? —It ____ be Timmy. He is sleeping now.[ ]A. can't B. may notC. mustn
• 生态系统的物质循环是指，组成生物体的物质在______与______之间的往返循环．-生物
• 某校研究性学习小组对某农田中影响农作物生活的各种生物因素和非生物因素进行了认真调查分析，并绘出了下列食物网．请据图分析回答：（1）该农田生态系统能量的源头是______．（2）-生物
• The mall will _____ for 12 hours on Sunday.[ ]A. openB. opensC. be open D. opening-九年级英语
• 在“草→青蛙→蛇→猫头鹰”这条食物链中，数量最少的是（）A．草B．蛇C．青蛙D．猫头鹰-生物
• —Can you play the guitar?— No, I _______, but my sister can.[ ]A. can’t B. don’t C. isn’t D. am not
• Can you _______ me how to play computer games?[ ]A. teachB. teachesC. teaching -七年级英语
• 句型转换。1．You can catch that bird. (改为否定句) ________ ________ ________ that bird.2．There is some bread f
• If you don't have much time, youhave a pet.[ ]A. mustn'tB. shouldn'tC. mustD. can