在一个生态系统中，细菌和真菌所起的作用是（）A．合成有机物B．分解有机物C．吸收太阳能D．吸收二氧化碳，产生氧气-八年级生物

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• Zhang Hua was glad that people _____ each other.[ ]A. can help B. is able to help C. could help D. c
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• 选择正确的词填空。amisare dodoescandon't1. I ______ a student. My name ______ Li Hong. 2. She ______ my
• —Who's singing in the next room? —It _____ be her. She has gone to New York. [ ]A. can'tB.
• — I answer this question in English? —No, you. You may answer it in Chinese.A．May; mustn’tB．Must; mu
• ---Must Jack come to sign his name on the paper?---Yes, he_____ .A．need B．mustC．mayD．will-九年级英语
• — You used to the bus to school, didn’t you?— Yes, I did. However, I am used to to school now.A．ta
• 生命体进行生命活动所需要的直接能源物质、主要能源物质和最终能源物质依次是（）A．糖类、脂肪、太阳能B．ATP、糖类、太阳能C．ATP、脂肪、太阳能D．ATP、核能、太阳能-八年级生物
• —______I take the newspaper away?—No, you mustn’t.You ______ read it only here.[ ]A. Must; can B. Ma
• 用am, is, are填空。1. Excuse me! ______ this your eraser?2. What ______ those? ______ they birds?3. This
• —How_____youspelltheword"pen"? —P-E-N,pen. [ ]A. is B. am C. do D. are -七年级英语
• ----May we leave the classroom now?----No, you . You to leave until the bell rings.A．mustn’t; are al
• ---Must we leave the classroom now?---No, you _____. You _____ leave after the bell rings.A．mustn�
• ——Who’s the man over there?Is it Mr. Black?——It______be him. He’s much taller.A．may notB．can’tC．will
• 在农田生态系统中，青蛙属于（）A．分解者B．消费者C．生产者D．非生物因素-八年级生物
• 下表为某生态系统的一条食物链在一年中流经各营养级的能量情况，请据表回答问题．生物ABCD能量（焦/米2）1.41×1071.59×1068.80×1048.71×107（1）该生态系统中的生产者是__
• 如图表示的是能量流动方向的示意图．请据图回答：（l）图中①表示______作用，它将太阳光能转变成储存在植物体内有机物中的能量，这个过程在细胞的______（叶绿体/线粒体）中进行．（-八年级生物
• 根据如图回答下列问题：（1）图中太阳光、空气属于生态系统的______部分．（2）图中属于初级消费者的是______，属于最高消费者的是______．（3）螳螂的发育属于不完全变态，与家蚕相比-八年级
• 用be动词的适当形式填空。1. What _____ your name?2. My telephone number _____ 2746598.3. This _____ my ID number
• ---Honey, stay home before I return. ---I _______, mum. A．mustB．can C．willD．should-九年级英语
• ---Is the girl in the red skirt your sister?---No. It _______ be her. She has flown to Australia.A．c
• ---Dad, must we wait until the light becomes green?---Yes, I’m afraid we ______. That’s the traffic
• The man in the office ____be Mr. Black because he phoned me from London just now.A．mustn’tB．may not
• This blue car ____________ be Bob’s bcause his car is black.A．can’t B．must C．could D．would-九年级英语
• 下列有关生产者、消费者和分解者之间关系的叙述，不正确的是（）A．生产者可为消费者提供食物和栖息场所B．消费者有助于植物传粉、受精、种子传播C．分解者可将动植物遗体分解成无-八年级生物
• —Where is Jack, please?—He _____ be in the reading room. [ ]A. can B. need C. would D. must -九年级英语
• Each of you _____ unique means you each _____unique.[ ]A.is, is B. are, areC. are, isD. is, are -七年级
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• — Do you know whose magazine is it?— I think it be Lily’s, for we can find her name on the cover.A．c
• — Be quiet, the head teacher Mr. Gu is coming.— Don’t worry. It _____ be him. Mr. Gu is much fatter.
• — Simon, when are we going to have a class meeting this week?— Sorry. Ask our monitor, please. He kn
• --Must I finish my homework now?--No, you _______ You can do it tomorrow.A. can't B. needn'
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• —–I think the man over there must be Tom.—–It _____ be him. He has ______ to America.A．can’t；goneB．c
• 如图表示生态系统的组成，图中X、Y分别代表（）A．绿色开花植物、酵母菌B．绿色开花植物、蝗虫C．生产者、酵母菌D．消费者、草-八年级生物
• 用am, is或are填空。1. He _____ my cousin.2 What_____ these?3. Here _____ two eggs for your sister.4. ____
• 从生态系统的组成来看，洞庭湖中的所有鱼属于（）A．生产者B．消费者C．分解者D．非生物成分-八年级生物
• You _________ get up so early. It’s weekend today.A．mustn’tB．can’tC．needn’tD．oughtn’t-九年级英语
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• ---I don’t want to go to school on foot. What should I do? ---You try asking your father for a bike,