在植物→昆虫→蛙→蛇这条食物链中，若蛇增加1g体重，至少要消耗植物（）A．1000gB．500gC．250gD．125g-生物

更多内容推荐

• 某个生态系统中的生物有：草、虫、鸟和鹰，其物质和能量流动方向正确的是（）A．草→虫→鸟→鹰B．草←虫←鸟←鹰C．虫→草→鸟→鹰D．鸟→虫-→鹰→草-生物
• The room_____very quiet. The students are playing outside.[ ]A. sound B. sounds C. sounded D. soundi
• The idea to eat in KFC________ wonderful. [ ]A. tastes B. sounds C. smells D. feels -八年级英语
• Tom's mother has _______ twice?[ ]A. been abroadedB. went abroadC. gone abroadD. been abroad-八年
• —What about the picture over there?—It _______ nice.[ ]A. tastes B. getsC. hears D. looks .-九年级英语
• --- ____I take the newspaper to the classroom? ---No, you mustn’t. You ______ read it only here.A．Mu
• —What does your brother do?—He _____ a teacher[ ]A. do B. doesC. worksD. is-七年级英语
• ---Whose notebook is this? --- It ________ belong to Lucy. Look, her name is in it.A．mustB．canC．can’
• 生态系统由______和______两部分组成，前者由生产者、______和分解者组成；后者由阳光、______、______等部分组成．-生物
• 生物圈中不可缺少的生物是（）A．绿色植物、动物B．绿色植物、细菌和真菌C．绿色植物、人类D．动物、细菌和真菌-生物
• ---Can I tell Peter about the news?---No, I don’t want anyone else to know it. You ______ keep it to
• 生态系统营养结构的基础是（）A．食物链和食物网B．生产者和分解者C．物质和能量D．光合作用和呼吸作用-生物
• 用am, is, are填空1. I _____ a teacher. 2. He _____ sad. 3. She _____happy.4. My eyes ____ black.5. Your
• Very loud noisesmake people ill. So wemake great noise.A．must ; mustn’tB．need ; needn’tC．can ; mustn
• ---_____book is this? --- I think it _____ Carla’s. It has his name on it.A．Who is, could beB．Who’s,
• "______ I borrow your bike?" "Sure. Here you are."A．WillB．CouldC．MustD．Should-八
• She _____ medium height _____ curly hair.[ ]A. has, hasB. is, hasC. has, withD. is, with-七年级英语
• 一个生态系统是______和非生物环境共同组成的．非生物环境主要包括______等因素．-生物
• 在一个草原生态系统中，最多的生物是（）A．狼B．植物C．羊D．老鼠-生物
• – I wait for him here? - NO , you needn’tA．MayB．MustC．CanD．Shall-八年级英语
• 据调查，某草原生态系统生活着如图所示的一些生物，请回答以下问题：（1）水、空气、阳光和土壤等属于该生态系统中的______成分．（2）该生态系统能量流动是从草进行______作用，固-生物
• —What color _________ Mary's shoes?—_________ black.[ ]A. are; They'reB. is; They'reC
• 用am或is填空。1. What ________ her name?2. Peter ________ her friend.3. Julia ________ a good teacher.4.
• —Who’s that over there, Is it Jane?—No, It ________ be Jane. She is ill in hospital today.A．won’t B．
• “Where’s my book? I can’t find it”.“It _______ on your desk.”A．may beB．maybeC．maybe isD．may is-八年级英语
• --- Whose comic book is it?--- It ________ be Daniel’s. He often shares his comic books with his fri
• 在生态系统中，物质和能量都是循环流动的______．-生物
• 根据下图，回答下列有关的问题：(1)图中的各种生物构成一个____________。(2)该生态系统中物质循环和能量流动的渠道有____________条。(3)作为完整的生态系统，还必须有的一种-八
• 深圳红树林生态系统中，属于生产者的是（）A．鸟B．红树林C．水D．鱼-生物
• 稻花香里说丰年，听取蛙声一片”，这千古名句描绘了美丽的田园风光，也道出了农田生态系统中“丰年”与“蛙声”的某种关系．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-生物
• ---Listen! Is Kitty in the next room? ---No, it ______ be Kitty. She has gone to Beijing.A．may notB．
• Here’s a film ticket, either you or he _____ allowed to go to the cinema.[ ]A. isB. are C. willD. ca
• They ______ students. They are teachers.[ ]A. don't B. doesn't C. isn't D. aren'
• --Can I play computer now? --No, you ______. You _____do your homework first.A．can; canB．can’t; must
• your parents at home last week?[ ]A. Is B. Was C. AreD. Were -七年级英语
• 选择填空。Pop and dance music ______ their favorite ______ of music. [ ]A．are, kinds B．is, kind C．is, kin
• 单项选择。They said their vacation ______ terrible. [ ]A. is B. are C. was D. were -七年级英语
• 某同学调查了当地农田生态系统中的部分生物，绘制了如下的生态系统，请据图回答（1）请写出该生态系统中，包含有4种生物的一条食物链：______．（2）生态系统中能量流动的特点是__-生物
• 在生态系统中有关食物链与能量流动的叙述中，不正确的是（）A．能量沿食物链流动是单向的B．食物链越长，最高营养级上的生物获得的能量越少C．初级消费者越少，次级消费者获得的能-生物
• --- The T-shirt with Michael Jackson’s picture ____ belong to Tom. He likes him a lot.---No, it ____
• The music _____ beautiful.[ ]A. looksB. feelsC. hearsD. sounds-八年级英语
• You be tired after one hour’s walk . please stop to have a rest.A. need B.must C.can-八年级英语
• Which _________ you rather __________, tea or coffee?A．would; to drinkB．would; likeC．would; /D．would
• Her song ________ sweet．We all like it． [ ]A．soundsB．tastesC．looks D．feels-八年级英语
• 绿色植物非生物成分阳光生物成分（生产者）水分生物成分（消费者）动物生物成分（分解者）微生物．-生物
• 输入第二营养级的能量，不可能的去向是（）A．随粪便排出体外B．流入第一营养级C．呼吸作用散失掉D．存在于生物的遗体残骸中-生物
• -How was the English evening party last night?-It was great fun. You ______ come.A．shouldB．mustC．may
• 在生态系统内能量流动的特点是（）A．单向性B．双向性C．循环性D．选择性-生物
• 大多数细菌和真菌是生态系统中的______．-生物
• 如图为碳循环示意图，据图分析（1）碳循环是以______的形成进行的．（2）二氧化碳是通过______作用流向B的．（3）二氧化碳从A．B．C流向大气是通过______作用实现的（4）A．B．C分别属