选取两只同样健壮的小白鼠，一只放入密闭且有充足食物的容器中，另一只放入有相同食物的铁笼子里。过了几天以后，观察两只小白鼠，会出现什么样的情况？你能说明理由吗？-七年级生物

更多内容推荐

• 下列各项不属于生物共有特征的一组是[]A．生长和生殖B．具有细胞结构C．不断从外界吸收营养D．能排出代谢废物-七年级生物
• 下面古诗中，描写生物生长发育的是[]A．泥融飞燕子，沙暖睡鸳鸯B．红豆生南国，春来发几枝C．两个黄鹂鸣翠柳，一行白鹭上青天D．明月别枝惊鹊，清风半夜鸣蝉-七年级生物
• 下图是具有保护色的百灵色，它可以有效地避免肉食鸟类的攻击和捕食，但容易被嗅觉发达的兽类（如狐等）所捕食，这说明了[]A．适应的普遍性B．适应的相对性C．适应的随意性D．适应的-八年级生物
• 地球不断有生物灭绝的现象发生，是[]A．上帝的安排B．与人类无关C．完全是由人类引起的D．一种自然现象-七年级生物
• 以下属于“排出废物”这种生物特征的是[]A．牛羊吃草B．人体流汗C．鲸鱼喷水D．种子萌芽-七年级生物
• 下列各种生物活动中，属于动物特有的是[]A．利用水和二氧化碳合成自身所需要的某些有机物B．通过消化分解食物中的有机物，并将可利用的营养成分吸收C．将有机物分解成二氧化碳和-七年级生物
• 下列属于学习行为的是[]A．大山雀偷饮牛奶B．蜘蛛结网C．婴儿吮奶D．母鸡育雏-七年级生物
• 下列能说明生物能对外界刺激出反应的是[]A．动物以植物为食B．含差羞草的叶片受到触动会合拢C．鲸呼气时会产生雾状水雾D．西瓜能进行光合作用制造有机物-七年级生物
• 下列各组中全部属于生物的一组是[]A．机器人、蜻蜓、钟乳石B．蘑菇、珊瑚虫、松树C．珊瑚、菊花、水草D．枯枝、鱼、树-七年级生物
• 阅读下列短文，然后回答问题：夏季在海滨游玩，若赶上退潮，在礁石之间的水洼中，往往能见到海葵。海葵呈圆柱形，十分柔软，极易收缩。它吸收水中的氧，将废物排到水中，它的-七年级生物
• 下面生物个体中，构成与其他三项不同的是[]A．杜鹃B．烟草花叶病毒C．放线菌D．向日葵-七年级生物
• 按照生物的形态结构特点可以将生物划分为[]A．植物、动物和其他生物B．脊椎动物和无脊椎动物C．单细胞生物和多细胞生物D．陆生动物和水生动物-七年级生物
• 下列生物中，不是由细胞构成的是[]A．噬菌体B．细菌C．动物D．植物-七年级生物
• 植物的根向地生长、动物会逃避有害的刺激，这说明[]A．生物都能生长B．生物都能对刺激作出反应C．生物都能适应环境并影响环境D．生物都具有遗传和变异的特征-七年级生物
• 一个多细胞生物体的所有细胞来自于[]A．细胞分裂B．细胞生长C．同一个受精卵D．细胞分化-七年级生物
• 下列属于生物的是[]A．恐龙骨骼B．木马C．小草D．钟乳石-七年级生物
• 壁虎遇到敌害会断尾逃脱，这一现象说明了生物[]A．能够由小长大B．繁殖后代C．对外界刺激会产生反应D．影响环境-七年级生物
• 下列除哪项外，都是生命特征的表现[]A．蜘蛛织网B．种子萌发C．森林起火D．月季开花-七年级生物
• Marydoesn'tlikeblue,sohermother____buysblueclothesforher.[ ]A.alwaysB.usually C.oftenD.never -七
• 句型转换。1. You can take the escalator to the second floor and get to the cafe. (对画线部分提问) Ithe second fl
• I ________ have a nap after noon.[ ]A. Some timesB. sometimes C. some time D. sometime-八年级英语
• 根据要求完成句子，每空填一词。1. He is never here. (改为反义句) He is _____ here.2. I like the novel by Smith. (把I改为Tony
• Jim was late for school at times last week. [ ]A. often B. never C. sometimes D. some times -九年级英语
• I ______ go to school by bike because I can't ride a bike.[ ]A. never B. something C. often D.
• I was doing the same job ___________, and I really feel exhausted. [ ]A. the whole time B. the all t
• Have you even seen him?A.before B. ago C. just now-八年级英语
• Sally has no time to visit her parents, but she makes telephone calls. She loves them so much.A. har
• –What do you think of Black Coal, Thin Ice?–It’s a good film., it is not suitable for teenagers.A．In
• — Zhang Lili, “the most beautiful teacher”, has moved us deeply. — Yes, and she is ______ popular wi
• It is raining very_______.A．heavyB．heavilyC．heavierD．more heavily-八年级英语
• It was very cold outside and we hadto go, so we had to stay at home .A．somewhereB．nowhereC．anywhereD
• We have to stay at home instead of going finishing because it is raining ________________.A．badlyB．
• ________, his new neighbor fell off his bike last week, and he was badly hurt.A．LuckilyB．LuckyC．Unlu
• 、This question is ______ easy, all the students can answer the question.A．too muchB．too manyC．much t
• --- The little girl dances so well. Where was she trained?-- She learns all by herself. She ______ g
• ---Where’s Mary? I didn’t see her this week.--- I didn’t see her, _____.A．otherB．tooC．eitherD．instea
• We talked _______ until Mr Wu asked us _______.A．happily, be quietB．happy, to be quietC．happily, to
• The sun is_____bigger than the earth. A．moreB．manyC．muchD．most-八年级英语
• The Internet is really useful to us. We can ________ find the information we need.A．slowB．slowlyC．ea
• The text is very easy for you. There are _____ new words in it.A．a fewB．a littleC．fewD．little-八年级英语
• How are you getting on with your work?—I can’t do it any longer. I’ll have to get help.A．carefullyB．
• Our garden is very beautiful, ____ in spring. A．speciallyB．especiallyC．mainlyD．nearly-九年级英语
• There are too many students asking teachers to help in the teachers’ office, but this room is ____ s
• ---______________ did you pay for the CD? ---Only nine dollars.A．How manyB．How muchC．How longD．How
• The dress is ________ expensive. I won’t have it.A．much tooB．too muchC．much moreD．more much-八年级英语
• ----May I borrow your pen, Mike ? ----Yes, of course. Here are some and you can take ______ of them.
• We shouldn’t watch __________TV because it is bad for our eyes.A．too muchB．too manyC．much tooD．many
• —_did he come?—He came to ask for help.A．HowB．WhenC．Where D．Why-九年级英语
• A smile costs nothing, but gives so ______.A．littleB．fewC．manyD．much-九年级英语
• -Is this factory ______ we will have a short stay?-Yes, it is in this factory ______ we will have a