21st Century is _____ a newspaper. Many students improve their English by reading it. [ ]A. over B.

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• 青蛙的生殖与发育过程在中进行，要经历受精卵、、幼蛙、成蛙四个时期．-八年级生物
• My English teacher has given me so much help that I really want to do something for him _____. [ ]A.
• I'm very happy that I didn't fail my Maths test ______. In fact I got one of the top score
• ______ hearing his father is dead,he feels very sad. [ ]A. AtB. In C. UponD. To -高一英语
• More and more young people are fond ____ playing tennis nowadays. [ ]A. on B. to C. in D. of -高一英语
• 下列对青蛙生活习性和生殖发育特点的描述中，不正确的是A．雄蛙和雌蛙的抱对有利于提高卵的受精率B．雄蛙的鸣叫是一种求偶行为C．青蛙既能生活在水中，又能生活在陆地上，所以它-八年级生物
• 两栖动物的生殖和幼体发育必须在中进行，幼体要经过发育才能上陆生活。-九年级生物
• 短文改错。此题要求改正所给短文中的错误。如无错误，在该行右边横线上画一个对号； 如多词，则用（ \ ）划掉；如缺词，则在此处加一个（^），并把正确的写在 横线上；如错一词，-高一英语
• 青蛙的发育方式为变态发育。（）-八年级生物
• We'll discuss the problem ______ lunch time. [ ]A. at B. over C. of D. when -高一英语
• The speech by the mayor of Shanghai before the final voting for EXPO 2010 is strongly impressed ____
• 你见过青蛙吗?青蛙的发育过程包括四个阶段，顺序是①受精卵②成蛙③蝌蚪④幼蛙A．①④③②B．①③④②C．①②③④D．①③②④-八年级生物
• Would you please tell me the quickest way ______ English well? [ ]A. to learn B. of learningC. how t
• We offered him our congratulations _____his passing the college entrance exams. [ ]A. at B. onC. for
• I left them alone, as I felt I was _____. [ ]A. in a way B. on the way C. in the way D. in no way -高
• 下列动物中，在其一生中的不同阶段具有不同的呼吸器官的是（）。A．哺乳动物B．两栖类C．鱼类D．鸟类-八年级生物
• “黄梅时节家家雨，青草池塘处处蛙”，蛙的生殖与发育过程中，不会发生的是A．雄蛙呜叫B．雌雄抱对C．育雏行为D．变态发育-八年级生物
• _____this term, we will have learned more than 2,000 words. [ ]A. At the end B. At the end of C. By
• 对以下生物的发育过程表述错误的是()A．蚂蚁：受精卵→幼虫→蛹→成虫B．青蛙：受精卵→幼蛙→蝌蚪→成蛙C．鸟类：受精卵→雏鸟→成鸟D．人类：受精卵→胚胎→胎儿→婴儿→成人-八年级生物
• 下图所示为青蛙的发育过程，回答下列问题⑴青蛙一般生活在_________的环境中，它的体色大多是_________。⑵青蛙的发育起点是［］_________，经过_________阶段最后发育成___
• —Who is the man _____here?— Mr. Black. [ ]A. in the charge B. under the charge C. in charge D. in ch
• They are letting us use their computers, and _____we are giving them the results of our research. [
• Mother wants to be a good provider, a role she has been shouldering _____ her marriage to Father. [
• ______ our arriving at the airport, we were given a warm welcome by the local people. [ ]A. WithB. A
• All passengers could get ______ as soon as they got onto the ship. [ ]A. food for free B. for free f
• 下列哪种生物，幼年与成年的呼吸器官是不同的A．章鱼B．甲鱼C．娃娃鱼D．鲸鱼-八年级生物
• They went in different directions _____ water in the desert.[ ]A. to search B. in search of C. searc
• “鸡生蛋，蛋生鸡。先有鸡还是先有蛋？”这个古老的问题难住了许多科学家。下列动物不是产卵繁殖，而是胎生动物的是A．丹顶鹤B．蝗虫C．蝮蛇D．梅花鹿-八年级生物
• 观察下面的青蛙发育过程图，回答下列问题：⑴从图中的发育过程看，青蛙的发育属于____________发育。(2)青蛙的精子和卵细胞在_________中结合，形成受精卵，完成受精作用，这种-八年级生物
• 青蛙的个体发育过程是（）A受精卵→蝌蚪→成蛙B受精卵→幼蛙→蝌蚪→成蛙C受精卵→幼蛙→成蛙D受精卵→蝌蚪→幼蛙→成蛙-八年级生物
• He's been told to _____the next month's meeting. [ ]A. be present B. be present at C. pres
• 下图为青蛙的生殖发育过程图，据图回答问题：（1）②是青蛙的幼体，用呼吸。（2）④时期的青蛙用呼吸，辅助呼吸。（3）按青蛙的发育过程用序号排序：。（4）从图中可看出青蛙的幼体和成体-八年级生物
• Don't be too hard ______ the boy; he didn't mean it. [ ]A. at; doing B. on; to do C. for;
• Is that the reason ______ at the meeting for his carelessness in his work? Actually we think he is a
• A clock must _____ keeps good time. [ ]A. in addition B. in return C. above all D. as well -高一英语
• 同青蛙一样，其他两栖动物的生殖和幼体发育必须在________中进行，幼体要经过___________发育才能上陆生活。-八年级生物
• 表1是某校生物课外科技小组人工孵化蛙卵的实验方案记录表（用同样大小的容器，装等量的水，孵化时间相同）。请回答：表1人工孵化蛙卵的实验记录项目组别水源水量/mL水温/℃蛙卵数-八年级生物
• 下列有关生物的生殖和发育的说法中，正确的是A．细菌通过芽孢繁殖B．植物组织培养和试管婴儿技术都属于无性繁殖C．鸡卵的卵黄表面有一盘状小白点，是胚盘，里面含有细胞核D．人的-九年级生物
• 下列对青蛙生殖发育特点的描述中，最恰当的是A．雌雄异体，体外受精，水中发育B．雌雄同体，体内受精，体内发育C．雌雄异体，体内受精，水中发育D．雌雄同体，体外受精，体外发育-八年级生物
• 青蛙个体发育的起点是A．雌蛙体内成熟的卵细胞B．受精卵C．刚孵出的小蝌蚪D．刚由蝌蚪发育成的小青蛙-八年级生物
• 下列对青蛙的生殖和发育过程的叙述，正确的是①卵细胞与精子在水中完成受精；②生殖和发育都在陆地进行；③从幼体到成体的发育是变态发育。A．①②B．①③C．②③D．①②③-八年级生物
• 两栖动物不能成为完全适应于陆地生活的主要原因是A．体温不恒定B．心脏结构简单C．肺不发达D．生殖发育离不开水-八年级生物
• This box is so heavy that he cannot lift it. ______, he is only a ten-year-old child.[ ]A. In all B.
• The two top students in Mr. Green's class competed _____ each other for the highest marks. [ ]A
• The head teacher _____ that the students inform their parents _____ the exam results. [ ]A. allows;
• 青蛙和大鲵的形态显著不同，但它们都属于两栖动物，共同的特征是（）A．成体在水中用鳃呼吸，在陆地上用肺呼吸B．成体既能在水中生活，又能在陆地上生活C．幼体用鳃呼吸，成体一般-八年级生物
• “稻花香里说丰年，听取蛙声一片”，这里的蛙声是雄蛙在A．求偶B．报警C．呼吸D．戏水-八年级生物
• 青蛙从蝌蚪到发育成成蛙的过程中，不可能出现的变化是A．尾消失B．体表出现鳞片C．长出四肢D．鳃消失-八年级生物
• “黄梅时节家家雨，青草池塘处处蛙”，青蛙鸣叫的目的是（）A．招引雌蛙B．寻找食物C．练习发音D．逃避敌害-八年级生物
• 和青蛙相比，鸟的成活率高，主要原因包括①体内受精②卵生③体外受精④卵外有卵壳做保护⑤亲鸟有孵卵育雏行为⑥胎生A．①④⑤B．②③C．①②④⑤D．①④⑤⑥-八年级生物