一个完整的生态系统由下列哪项组成（）A．生产者、消费者、分解者B．水、阳光、温度C．非生物成分和生物成分D．食物链和食物网-生物

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• 下列属于一个生态系统的是（）A．一片森林和其中所有的生物B．森林中所有的松树C．森林中所有生物D．森林中所有的植物-七年级生物
• 图示某湖泊生态系统中的几种生物，由于大量污水的排入，该湖泊多次发生蓝藻爆发，周边居民也有出现有毒物质中毒现象．请分析回答．（1）生态系统中的生产者是______．（2）该生态系-八年级生物
• Today is Wednesday. He _____ be at home. He _____ be at school.A．can't; canB．can't; mustC．
• Li Lei ______ a Chinese boy.[ ]A. am B. is C. are D. be -七年级英语
• Your clothes ____________ on the bed.[ ]A. isB. amC. areD. be-七年级英语
• —Can you go skateboarding with us, Toby?—Sorry, I can't. I _____ take the piano lesson every Sa
• —May I try on the jeans? —Yes, you ____. [ ]A. should B. can C. must D. need-八年级英语
• 动物和我们人类不能将无机物合成有机物，只能吃现成的______，因而被称为______．-生物
• 下列食物链损耗的总能量最少，即可利用的能量最多的是（）A．植物-→兔子-→猫头鹰B．植物-→野鼠-→地鼠-→狮C．植物-→蝴蝶-→蜻蜒-→蛇D．植物-→鹿-生物
• 如图是真菌、腐生细菌等在物质循环中的作用示意图，请据图回答下列问题．（1）图中腐生细菌的生殖方式是______；图中的家兔、鹿等动物在生态系统的组成中属于______．（2）绿色植物-生物
• 如图是某生态系统的简单示意图，请据图分析回答：（1）图中的禾谷类、水草能制造有机物，是生态系统的______，而昆虫、兔、鹰、鱼等是生态系统的消费者．（2）该生态系统中，禾谷类-八年级生物
• 如图所示，生态系统各组成成分之间存在着密切的关系．据图回答：（1）图中①表示的生理过程是______．（2）从功能上看，图中A所示生物是生态系统中的______．（3）请写出图中的食物链__-八年级生
• —Where_______ my pictures?—______ are in your bag. [ ]A. is, these B. are, They C. are, Those D. is,
• Which of the two pencils ___ yours ?[ ]A are B is C have D has -七年级英语
• Lucy, Jim and Li Lei ____good friends.[ ]A. is allB. are allC. all is D. all are -七年级英语
• This pair of shoes ______ Li Gang’s ,It’s too big for him .A．can’t beB．could beC．might beD．must be-九
• —Have you decided when to leave for Australia?—Not yet. We _________ set off at the end of this mont
• —______ the wolves European? —Yes, they ______. [ ]A. Are; areB. Do; doC. Is; isD. Does; does -七年级英语
• 如图表示某生态系统中物质循环的过程，其中，A、B、C、D分别表示生态系统中的生物成分，①----④表示生物的生理过程，⑤表示某种物质．请分析回答：（1）图中生态系统的生产者是___-生物
• 所有生物生命活动所需能量的最终来源（根本来源）是（）A．植物B．动物C．生物圈D．太阳能-八年级生物
• 单句改错。( )1. How much is these black pants?A B CD( )2. Do you need bags for sports and school? A B CD(
• 用括号里的单词的适当形式填空。1. How much______these pants? They are fifteen dollars. (be)2. I'm sorry I can&#
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• This toy bear _______ be Jane's. She's the only kid at the picnic. [ ]A. must B. can C. ne
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• He would rather _______ at home than ______ to the park with Jenny.A．stay, goB．to stay, to goC．stays
• Lucy doesn’t mind _______ the dishes after dinner.A．washB．to washC．washingD．washed-八年级英语
• You’d better ____ football in the street.A．playB．not playC．not to playD．not playing-八年级英语
• Would you mind ____ here? Sorry, I won’t. A．smokeB．smokingC．not smokingD．smokes-八年级英语
• 用括号内所给动词的适当形式填空。1. My favourite season_____ (be) autumn.2. I think this pair of jeans _____ (look) n
• 一般情况下，一个自然生态系统的下列叙述错误的是（）A．生产者的数量最多B．消费者的数量最多C．食物链末端凶猛动物的数量最少D．生物数量沿着食物链递减-八年级生物
• 生态系统中的能量沿着食物链逐渐（）A．减少B．增加C．不变D．以上都有可能-生物
• 在生态系统中，属于生产者的是（）A．植物B．昆虫C．蘑菇D．哺乳动物-生物
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• There ______ some information about the story. [ ]A. amB. isC. areD. be-七年级英语
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• You _________ to the meeting this afternoon if you have something important to do . A．needn’t to com
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• We _____ happy because we _____ have computers. [ ]A. aren't; aren't B. aren't; don&#
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