某一湖泊生态系统的食物链为藻类→虾→小鱼→大鱼，此食物链中的四类生物按顺序以甲、乙、丙、丁为代号建立能量金字塔（如右图）．今有10只人工饲养的鳄鱼逃逸栖居进入该湖泊，则该-生物

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• —_____ you read books? —Yes, I _____.[ ]A. Can, do B. Do, can C. Can, can D. Can, read-七年级英语
• —Is the man over there Mr White?—No, it_____ be him. I saw him in the office a minute ago.[ ]A. may
• It's cold outside . We _____ stay in the classroom[ ]A.mustB.can C.havetoC.might-八年级英语
• I thought youlike something to read, so I have brought you some books.[ ]A. mayB. mightC. canD. coul
• 生态系统中能量流动的特点是（）A．循环往复，逐级递增B．单向流动，逐级递增C．循环往复，前后不变D．单向流动，逐级递减-生物
• 在一个稳定的池塘生态系统中，一种突发的污染使所有的植物死亡，在科研测量的变化中，首先降低浓度的是（）A．二氧化碳B．无机盐C．氧气D．一氧化碳-生物
• 根据如图生态系统中的生物，分析回答下列问题：（1）请在图上用箭头画出所有的食物链．（2）这个生态系统共有______条食物链，它们相互交错形成______，写出最长的一条食物链：____-生物
• 用can或can't加下面一个动词填空。 speak, see, hear, play, color, ask, drive, fly, spell, go1.I'm sorry
• —Could you please tell me the way to the station?—Sorry, I’m a stranger too. You ______ ask the poli
• —_____ he play table tennis?—No, he _____. [ ]A. Is; isn't B. Can; can't C. Can; isn'
• 在生态系统中，下列哪项是消费者（）A．蘑菇B．野兔C．阳光D．牧草-生物
• — I keep the book a little longer?—Yes, you can.[ ]A. MustB. NeedC. CanD. Should-九年级英语
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• I often see lights in that empty house. Do you think I ______ report it to the police? [ ]A. should
• 句型转换。1. It's necessary to study hard in the school.(同义句)______ ______study hard in the school.
• 下列叙述正确的是（）A．在一个生态系统中，生产者、消费者、分解者是紧密联系、缺一不可B．维持生态平衡，就是维持生态系统内部各种生物的数量稳定不变C．人类所需的资源中，土地-生物
• _____ you ride _____ horse? [ ]A. Are; the B. Can; a C. Are; a D. Can; the-七年级英语
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• —Bill, is the pink umbrella Anna’s?—No, itbe hers. Hers is purple. [ ]A. canB. may not C. wouldD. ca
• 如图示草原生态系统，请分析回答：（1）此生态系统中的生产者是______，分解者是______、______．（2）生产者与消费者之间的关系主要是______的关系它们之间相互交叉形成了______，
• 从“狼吃羊，羊吃草”可以看出，狼体内的有机物最终来源于（）A．草B．水C．羊D．阳光-生物
• You_____ be so hurry as the time is not so late.[ ]A. mustn’t B. mustC. can notD. will not-八年级英语
• 根据句意，从方框内选择合适的情态动词完成句子。must, may, can, could, might, can’t1. The brown wallet_____be Tom’s or Bill’s
• — This capTina's. I know she has a red cap. — No, it be Tina's. I am wearing her cap now.
• —How about singing songs with me?—I’m sorry I can’t. Ihelp my father with his work. [ ]A. have toB.
• 把下列生物与它在生态系统中所占的位置用线连接-生物
• - your brother play basketball, John? -No, he .[ ]A. Is; isn'tB. Can; canC. Can; can'tD. A
• "Must I come here before eight o'clock?" "No, you ______." [ ]A. can'
• 请按各小题的要求转换句型，保持句子原意，每个空格只准填一个单词。 1．We don't usually have to get there too early. (改为同义的) We get
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• Jack _______ swim when he was five years old. [ ]A. canB. could C. may D. must-八年级英语
• 下列说法错误的是（）A．我们饮用牛奶所获得的能量最终来自于太阳B．如果在人的皮肤表皮细胞内成功植入叶绿体，则我们人也能向植物一样进行光合作用C．植物的蒸腾作用会受到各种物-生物
• 下列各项生物中，属于生产者的是（）A．水草和小麦B．鱼虾和海带C．蘑菇和青菜D．食草鱼类和玉米-生物
• —Must I finish the job this afternoon?—Yes, you _____, but you ______ finish it now.[ ]A. must; must
• The bike _____ be Adam's. Look! His bag is on it.[ ]A. canB. mustC. can'tD. mightn't-
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• Maybe he can _____ in our club.[ ]A. beB. isC. /-七年级英语
• You ______ go and ask Meimai.She _____ know the answer. [ ]A. must, canB. must, mayC. need, mayD. ca
• 生态系统的组成成分有（）A．生产者、分解者和非生物成分B．生产者、初级消费者、高级消费者、分解者C．消费者、分解者、病毒、非生物成分D．生产者、消费者、分解者、非生物成分-生物
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• 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