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

更多内容推荐

• 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&#
• —Which cake do you like better?—I prefer this one. It ______ more delicious. [ ]A. soundsB. tastes C
• This toy bear _______ be Jane's. She's the only kid at the picnic. [ ]A. must B. can C. ne
• The CDs ____________ in the drawer(抽屉). [ ]A. amB. isC. are-七年级英语
• ----- Must I park my car behind the building?------No, you ___________ . You ___________ park it her
• 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
• 在维持一个生态系统的稳定中必不可少的生物是生产者和分解者．______．-生物
• There ______ some information about the story. [ ]A. amB. isC. areD. be-七年级英语
• 选用is，am，are，填空。1. —What _______ your name? —I _______ Daming.2. This _______ my son, Yangyang.3. Hel
• –Mom, may I go swimming with my friends in the river? –No, you _________. That’s too dangerous.A．won
• You _________ to the meeting this afternoon if you have something important to do . A．needn’t to com
• If you study harder , you will ___________go to college .[ ]A. canB. are able toC. be able toD. be a
• 用所给词的适当形式填空，每空不限一词。1. I think Sandy and Lucy_____ ( be ) in the same class.2. _____ Amy _____ (take)
• We _____ happy because we _____ have computers. [ ]A. aren't; aren't B. aren't; don&#
• 如图为生态系统各个成分间的相互关系．下列有关说法错误的是（）A．A是生产者，它能够将无机物转变为有机物B．B为消费者，它和C的关系为消费关系C．C是分解者，它对生态系统的物质-生物
• “落红不是无情物，化作春泥更护花”（清•龚自珍《己亥杂诗》），这句诗描绘出了哪一种生物因素在生物圈物质循环中的作用（）A．分解者B．生产者C．消费者D．都不是-生物
• Look! Some oranges ______ on the table and there ______ some orange in the bottle. [ ]A. is;isB. is;
• 句型转换1. His name is Nick. (改为同义句)_____ Nick. 2. Her last name is Green. (改为同义句) Her _____ name is Gre
• —David，is that man your Chinese teacher?—It___________ be him．He’s having a meeting． A．mustn’tB．can’
• —Must I make a phone call to him now?—No, you________. You ______ write an email.A．mustn’t; mayB．may
• Tony _____ go to the opera on Saturday because he's going to have a meeting. [ ]A. can't B
• The toy shop near my school _______ all day on Sunday. [ ]A. opensB. openingC. openD. is open-七年级英语
• 生态系统生物部分植物--()()--消费者细菌、真菌--()非生物部分--()．-生物
• — I broke the window. — You ____ play football near the window.A should B. shouldn’t C. had better D