在生态系统中，与碳循环始终结合在一起进行的是（）A．氮循环B．水循环C．能量流动D．能量循环-生物

更多内容推荐

• 根据句意，用括号内所给单词的适当形式填空。1. That _______ (sound) interesting.2. Here are my _______ (photo).3. What'
• He ________be at home because the light in his room is on.A．mustB．can’tC．canD．mustn’t-八年级英语
• 生物图中的动物必须直接或间接依靠下列哪项才能得以生存（）A．肉类食品B．绿色食品C．鸡蛋牛奶D．各种鱼类-生物
• Gina dances well. She can ____ in our school music festival.[ ]A. is B. am C. beD. are-七年级英语
• —______he at home now?—Yes, he is. He is______computer games. [ ]A. Is; playing B. Does; playC. Do;
• （1）生态系统的成分包括非生物的______、生产者、______和______．因此，在草原生态系统中，除图中表示出的各种生物外，还必须有______等生物类群．（2）在生态系统中，不同生物之-生物
• 在水草→草鱼→乌龟→人，这条食物链中，含能量最多的是（）A．水草B．草鱼C．乌龟D．人-生物
• I’m very glad I have my own room in my house. I ______ do what I want in it.A．mustB．have toC．needD．c
• Li Lei and I ______ good friends.[ ]A. areB. am C. is D. be-七年级英语
• You ______ to the meeting this afternoon if you have something important to do.A．needn’t to comeB．do
• 下列生物中属于生产者的是（）A．海带B．蘑菇C．酵母菌D．紫菜E．蕨菜F．木耳-生物
• 在生态系统中，能量流动一般是从绿色植物固定太阳能开始的。[]-八年级生物
• Here _____some flowers.[ ]A.isB.areC.amD./-七年级英语
• That man ________ be Mary’s father, as he is much taller.A． canB．mustC． can’tD． mustn’t-八年级英语
• The teacher says we _____read ______ comic books.A．mustn’t, much tooB．can’t, much tooC．may not, too
• Her watch_____ in her backpack. [ ]A. am B. is C. are D. be -七年级英语
• -your twin brother’s name Nick ?-Yes, is.[ ]A．Are,heB．Is , heC．Are,it D．Is,it -七年级英语
• 现在一些商店里流行一种生态球，该球密封，内装有水，两三条小鱼或小虾自由地在水中游动着，底部有珊瑚、沙子，并长有一些绿绿的水藻．（1）这个生态球可以看作是一个生态系统吗-生物
• ----Listen! Is Kitty in the next room? ---- No, it ______ be Kitty. She has gone to Beijing.A．may no
• — you speak Chinese, Miss Green?— Yes, I can.A．MayB．CanC．MustD．Need-九年级英语
• （1）在这个生态系统中，有______条食物链，最长的一条食物链是______．（2）在这个食物网中，生产者是______，属于消费者的是______．（3）在这个生态系统中，鼠与蛇的关系是_____
• — _____ you find _______ ways to work out this problem, Jim? — Yes, I ______.A．Could; another; could
• Boys, you ______ be sitting in this room. It is for your teachers only.A．shouldn’tB．don’t have toC．w
• Wang Mei _____ her mother because she is beautiful and intelligent.[ ]A. lookB. likedC. is likeD. lo
• ---Look at the boy running on the playground. Is it David? ---It ______ be him. I saw him go to the
• This lift __________ only hold 12 people. It’s full now. We ________ wait for some more time.A．can;
• I _____ Tom. What _____ your name? [ ]A. am, am B. am, is C. is, is D. is, am -七年级英语
• For everyone’s safety, we ___________ a1ways remember the law against driving after drinking.A．coul
• Mum prepares breakfast for us every morning, so she __________ early.A．used to get upB．is used to ge
• If the green light doesn’t come on, you ______ go across the street.A．mustB．needn’tC．mustn’tD．have t
• 真菌和细菌在自然界中的重大作用是（）A．生产者B．初级消费者C．次级消费者D．分解者-生物
• —What is Mom cooking in the kitchen?—Chicken, I guess. How nice it_____! [ ]A. looks B. smells C. ta
• The milk ________ strange. Do you think it's OK to drink? [ ]A. was tastedB. tasted C. is tasti
• 用be动词的适当形式填空。1.There____afootballmatchonTV yesterday evening.2. There____not enough people to pick a
• Where ____ you ____? [ ]A. do; from B. are; from C. is; from D. are; come from-七年级英语
• I hear you've got some new Australian coins. __________ I have a look?A．DoB．MayC．ShallD．Should-
• In our library, the number of books _______ more than 40,000. [ ]A. is B. are C. has D. have -九年级英语
• 如图是某生物兴趣小组对一个农田生态系统做调查之后，所绘制的食物网简图．据图回答问题．（1）从生态系统的组成成分看，图中的植物属于农田生态系统的______．（2）从生物与环境的-生物
• 南京的秦淮河曾因污染而失去应有的生态功能．近年来，当地政府加强了对秦淮河的综合治理，使该河的生态系统又得到了重新恢复和改善．（为探究该河生态恢复状况，）某中学的几位同-生物
• The man ______ be my father. My father is much taller.A．canB．mustC．can'tD．mustn't-九年级英语
• English is a language that many people around the world _______not speak perfectly but _________at l
• 如图为生态系统中各种生物之间的关系，请回答下列问题：（1）生态系统的组成成分中除生物部分外，还包括______，如阳光、空气、水等．（2）在生态系统的生物部分中，动物属于_____-生物
• —________ you open the window, please? —Yes, I can.A．MayB．NeedC．MustD．Can-九年级英语
• 梨和香蕉的腐烂，是因为细菌将水果中的有机物分解成简单的物质，这说明细菌在生态系统中扮演的角色是（）A．生产者B．消费者C．分解者D．分解者和生产者-生物
• —What he enjoys _____ great and interesting.—Yes, but it’s dangerous. [ ]A. soundsB. sounding C. sou
• ---Where’s Lucy?---I’m not sure. She ________ in the school library.A．maybeB．must beC．may beD．will b
• --Excuse me，Mr. Li,_________ I close windows? It’s cold now.--Yes，you__________A．can; can't B．c
• 细菌和真菌在自然界中的作用是不可低估的．请你根据下页图提供的信息并利用已学过的生物学知识，解决下列问题．（1）将图中各部分之间的关系用箭头联系起来．（2）将图中未完成的部-生物
• 流入生态系统的总能量是[]A．照射到生态系统上的全部太阳能B．照射到绿色植物上全部太阳能C．生产者通过光合作用固定的太阳能D．流入消费者体内的能量-八年级生物
• 环节动物中的蚯蚓主要食用落叶等腐败物，并把这些腐败物分解为无机物．蚯蚓在生态系统中属于（）A．生产者B．消费者C．分解者D．以上都不是-生物