如果将一条死鱼埋在地下，一段时间后发现鱼肉“不见”了，这是生态系统中（）的作用．A．生产者B．消费者C．分解者D．以上都不是-生物

更多内容推荐

• —Shall we go to the beach, Amy? —Um, it ______ great. [ ]A. feels B. looks C. turns D. sounds -九年级英语
• Which pair contains the sound／／?A．other；thankB．Thursday；strengthC．thin；thisD．brother；healthy-九年级英语
• ----- I want to know if I _________ smoke here. ----- No, you ___________. Can’t you see the sign “N
• The skirt is made of silk. It ______ so soft, I like it. [ ]A. washes B. is washed C. is felt D. fee
• Look at my pictures, I took them in New York.They _____beautiful.[ ]A. lookB. soundC. readD. see-八年级
• —Must I finish my homework right now?—No, you.A. needn’t B. may not C. mustn’t-九年级英语
• 在一个池塘生态系统中属于生产者的是（）A．水草、浮游植物B．浮游动物C．植食性鱼类D．肉食性鱼类-生物
• 如图是表示生态系统中生产者、消费者和分解者之间的相互关系．（1）食物链和食物网是生态系统的结构基础．写出图中的一条食物链______（2）生态系统的物质循环是指组成生物体的物质-生物
• –Whose volleyball is this?–It _______ belong to Carol. She loves volleyball.A．mustB．mustn’tC．canD．ca
• ----Is that Henry?----No. He here. He has gone to Australia.A．may beB．mustn’t beC．can’t beD．might be
• -------May I take my pet dog with me into the cinema? -------The rule says no. So you ______.A．canB．
• Their number ______ smaller and smaller. [ ]A. is getting B. are getting C. will change D. will chan
• There________ some milk in the bottle. [ ]A. isB. areC. be -八年级英语
• 如图表示某生态系统中的食物关系，请据此回答下列有关问题．（1）请用“生产者”、“消费者”、“分解者”填空．从生态系统的成分看，图中的青草属于______；兔、鼠、鹰等动物属于____-生物
• 下列生物中不属于生产者的是（）A．银杏B．野草C．粮食作物D．蘑菇-生物
• 生态系统是由生产者、消费者、分解者组成的．______．-生物
• You ________ come tomorrow. I can do it myself.A．needn’tB．mustn’t C．can’tD．shouldn’t-九年级英语
• —____ you Kate Green? —No, my name _____ Mary Green. [ ]A. Is, am B. Are, is C. Are, am -七年级英语
• —Let's play volleyball. —That_____ interesting.[ ]A. may B. sounds C. be-七年级英语
• —It is fine, _______ play tennis.—That _______ good.[ ]A. let, sounds B. let's, sounds C. let&#
• 句子练习1. This is a pencil sharpener.(对划线部分提问)_______ _______？2. That is her phone number.（改为一般疑问句）____
• 生态系统中的能量流动的特点是（）A．循环流动，逐级递减B．循环流动，逐级增加C．单向流动，逐级增中D．单向流动，逐级递减-生物
• This is Miss Gao. She_____your new teacher. [ ]A. beB. am C. is D. are -七年级英语
• —Must I take much medicine every day?—No, you ________.A．mustB．mustn’tC．needn’tD．can’t-八年级英语
• 当动物以植物为食后，植物体内的能量就全部流入到动物体内．（）判断的理由：-生物
• — _______ do you go shopping with your mother?— I seldom do that.A．How oftenB．How soonC．How farD．How
• This pair of shoes ______ Li Gang’s ．It’s too big for him ．A．can’t beB．could beC．might beD．must be-九
• 人类排放的有毒物质进入生态系统，有毒物质是通过___________来传递和不断积累的。-七年级生物
• If I you, I'd be here earlier. [ ]A. was B. were C. am D. be -九年级英语
• It’s Sunday tomorrow, so you _______ get up so early. A．needn’t toB．need toC．don’t need toD．don’t ne
• 用所给词的适当形式填空。1. Mr Green _______ (be) his father.2. _______(this) are English maps.3. I don't kn
• 阅读下面材料，结合所学知识回答问题．材料（一）“太湖美，太湖美，美就美在太湖水”，然而，随着大量富含氮（N），磷（P）等元素的生活污水被排放进太湖，导致水体富营养化，湖内的-生物
• Chengdu _____ a beautiful place to live in. [ ]A. sounds B. sounds like C. sound like -八年级英语
• 如图1所示为一草原生态系统中狼、草类和兔子的数量关系图，请据图回答问题：（1）A代表的生物是狼，B代表的生物是______，C代表的生物是______．（2）实行退耕还牧政策之后，草原生-生物
• 如图表示生物与环境的关系，据图作答：（1）图中的生物与环境所形成的统一整体叫做______．（2）图中标号______能利用光能制造有机物，是生态系统中的生产者．（3）图中：A→B→C是一条_-生物
• --Whose tennis racket is this, Linda?--Look! Jerry's name is on it! It _________ be his.A．mayB．
• Teenagers _______ allowed to drive in the street ．A．should not beB．should be notC．not should beD．sho
• —What's John going to do next Saturday?—I am not sure.He_____ go to the country to see his aunt
• The twin brothers _ students.[ ]A. are both B. both areC. are allD. both is-八年级英语
• 人类排放的有毒物质进入生态系统会在生态系统的作用下变成无毒物质。[]-七年级生物
• -Good aftenoon! My name_______Mary-Good afternoon !I _______Tom.[ ]A. is; is B. am; am C. is; am D.
• 在生态系统中，当食物链逐级传递时，能量流动是（）A．每一环节都将大部分能量向下传递，自己只将10%～20%的能量用于呼吸B．每一环节都将一部分能量用于维持自己的生命活动．只能向-生物
• 如图为某生态系统的一个生物链各生物体的能量含有情况，请据图回答：生物ABCD能量（J*m-2）141.10×10515.91×1050.88×105871.27×105（1）生产者是______，消费
• By the time I got to the train station, the train _______ for ten minutes. I had to wait for the nex
• The boy's name_______ Peter.[ ]A. am B. is C. are D.be-七年级英语
• 如图，草原上的部分生物示意图，据图回答：（1）在生态系统的组成上，草和各种动物分别属于______．（2）要保持草原生态系统的平衡，你认为植物、草食动物、肉食动物之间的数量关系-生物
• ---Can you drive a car? --- No, I ________. I’m not old enough to get a license.A．needn’tB．may notC．
• —_______ you read the words in English? —No, I can’t. They are too difficult for me.A．MustB．MayC．Can
• —Excuse me, _____ I borrow this book?—Of course.A. will B. may C. must-七年级英语
• -How long have you__________ here?-About two months.[ ]A. beenB. goneC. comeD. arrived-八年级英语