共用题干第二篇
Where Have All the Frogs Gone?
In the 1980s,scientists around the world began to notice something strange:Frogs
were disappearing. More recent research has shown that many kinds of amphibians（两栖
动物）are declining or have become extinct. They have been around for a long time一over
350 million years.Why are they dying out now?
Scientists are seriously concerned about this question.First of all,amphibians are an
important source of scientific and medical knowledge.By studying amphibians,scientists
have learned about new substances that could be very useful for treating human diseases.
Further research could lead to many more discoveries,but that will be impossible if the
amphibians disappear.
The most serious aspect of amphibian loss,however,goes beyond the amphibians
themselves.Scientists are beginning to think about what amphibian decline means for the
planet as a whole.If the earth is becoming unlivable for amphibians,is it also becoming
unlivable for other kinds of animals and human beings as well?
Scientists now believe that amphibian decline is due to several environmental factors.
One of these factors is the destruction of habitat,the natural area where an animal lives.
Amphibians are very sensitive to changes in their habitat.If they cannot find the right
conditions,they will not lay their eggs一These days,as wild areas are covered with
houses,roads,farms,or factories,many kinds of amphibians are no longer laying eggs.
For example,the arroyo toad（蟾蜍）of southern California will only lay its eggs on the
sandy bottom of a slow-moving stream.There are very few streams left in southern
California,and those streams are often muddy because of building projects. Not
surprisingily,the arrovo toad is now in danaer of extinction.
There are a number of other factors in amphibian decline.Pollution is one of them.In
many industrial areas,air pollution has poisoned the rain,which then falls on ponds and
kills the frogs and toads that live there,In farming areas,the heavy use of chemicals on
crops has also killed off arrtphibians.Another factor is that air pollution has led to increased
levels of ultraviolet (UV) light. This endangers amphibians, which seem to be especially
sensitive to UV light. And finally, scientists have discovered a new disease that seems to
be killing many species of arnpttibians in different parts of the world.
All these reasons for the disappearance of amphibians are also good reasons for more
general concern. The destrriction of land, the pollcition of the air and the water, the
changes in our atmosphere, the spread of diseases-these factors affect human beings,
too. Amphibians are especially sensitive to environmental change. Perhaps they are like
the canary （金丝雀）bird that coal miners once used to take down into the mines to detect
poisonous gases. When the canary became ill or died,the miners knew that dangerous
gases were near and their own lives were in danger. The arroyo toad is disappearing becauseA:it has been threatened by frogs. B:it is losing its habitat.C:a disease has been killing its eggs. D:it can't bear the cold of winter.

相关问题推荐

• 共用题干第二篇
  Where Have All the Frogs Gone?
  In the 1980s,scientists around the world began to notice something strange:Frogs
  were disappearing. More recent research has shown that many kinds of amphibians（两栖
  动物）are declining or have become extinct. They have been around for a long time一over
  350 million years.Why are they dying out now?
  Scientists are seriously concerned about this question.First of all,amphibians are an
  important source of scientific and medical knowledge.By studying amphibians,scientists
  have learned about new substances that could be very useful for treating human diseases.
  Further research could lead to many more discoveries,but that will be impossible if the
  amphibians disappear.
  The most serious aspect of amphibian loss,however,goes beyond the amphibians
  themselves.Scientists are beginning to think about what amphibian decline means for the
  planet as a whole.If the earth is becoming unlivable for amphibians,is it also becoming
  unlivable for other kinds of animals and human beings as well?
  Scientists now believe that amphibian decline is due to several environmental factors.
  One of these factors is the destruction of habitat,the natural area where an animal lives.
  Amphibians are very sensitive to changes in their habitat.If they cannot find the right
  conditions,they will not lay their eggs一These days,as wild areas are covered with
  houses,roads,farms,or factories,many kinds of amphibians are no longer laying eggs.
  For example,the arroyo toad（蟾蜍）of southern California will only lay its eggs on the
  sandy bottom of a slow-moving stream.There are very few streams left in southern
  California,and those streams are often muddy because of building projects. Not
  surprisingily,the arrovo toad is now in danaer of extinction.
  There are a number of other factors in amphibian decline.Pollution is one of them.In
  many industrial areas,air pollution has poisoned the rain,which then falls on ponds and
  kills the frogs and toads that live there,In farming areas,the heavy use of chemicals on
  crops has also killed off arrtphibians.Another factor is that air pollution has led to increased
  levels of ultraviolet (UV) light. This endangers amphibians, which seem to be especially
  sensitive to UV light. And finally, scientists have discovered a new disease that seems to
  be killing many species of arnpttibians in different parts of the world.
  All these reasons for the disappearance of amphibians are also good reasons for more
  general concern. The destrriction of land, the pollcition of the air and the water, the
  changes in our atmosphere, the spread of diseases-these factors affect human beings,
  too. Amphibians are especially sensitive to environmental change. Perhaps they are like
  the canary （金丝雀）bird that coal miners once used to take down into the mines to detect
  poisonous gases. When the canary became ill or died,the miners knew that dangerous
  gases were near and their own lives were in danger. The arroyo toad is disappearing becauseA:it has been threatened by frogs. B:it is losing its habitat.C:a disease has been killing its eggs. D:it can't bear the cold of winter.

  查看答案
• 共用题干第二篇
  Where Have All the Frogs Gone?
  In the 1980s,scientists around the world began to notice something strange:Frogs
  were disappearing. More recent research has shown that many kinds of amphibians（两栖
  动物）are declining or have become extinct. They have been around for a long time一over
  350 million years.Why are they dying out now?
  Scientists are seriously concerned about this question.First of all,amphibians are an
  important source of scientific and medical knowledge.By studying amphibians,scientists
  have learned about new substances that could be very useful for treating human diseases.
  Further research could lead to many more discoveries,but that will be impossible if the
  amphibians disappear.
  The most serious aspect of amphibian loss,however,goes beyond the amphibians
  themselves.Scientists are beginning to think about what amphibian decline means for the
  planet as a whole.If the earth is becoming unlivable for amphibians,is it also becoming
  unlivable for other kinds of animals and human beings as well?
  Scientists now believe that amphibian decline is due to several environmental factors.
  One of these factors is the destruction of habitat,the natural area where an animal lives.
  Amphibians are very sensitive to changes in their habitat.If they cannot find the right
  conditions,they will not lay their eggs一These days,as wild areas are covered with
  houses,roads,farms,or factories,many kinds of amphibians are no longer laying eggs.
  For example,the arroyo toad（蟾蜍）of southern California will only lay its eggs on the
  sandy bottom of a slow-moving stream.There are very few streams left in southern
  California,and those streams are often muddy because of building projects. Not
  surprisingily,the arrovo toad is now in danaer of extinction.
  There are a number of other factors in amphibian decline.Pollution is one of them.In
  many industrial areas,air pollution has poisoned the rain,which then falls on ponds and
  kills the frogs and toads that live there,In farming areas,the heavy use of chemicals on
  crops has also killed off arrtphibians.Another factor is that air pollution has led to increased
  levels of ultraviolet (UV) light. This endangers amphibians, which seem to be especially
  sensitive to UV light. And finally, scientists have discovered a new disease that seems to
  be killing many species of arnpttibians in different parts of the world.
  All these reasons for the disappearance of amphibians are also good reasons for more
  general concern. The destrriction of land, the pollcition of the air and the water, the
  changes in our atmosphere, the spread of diseases-these factors affect human beings,
  too. Amphibians are especially sensitive to environmental change. Perhaps they are like
  the canary （金丝雀）bird that coal miners once used to take down into the mines to detect
  poisonous gases. When the canary became ill or died,the miners knew that dangerous
  gases were near and their own lives were in danger. Scientists think that the decline of amphibians couldA:cause environmental change.B:cause a decline in other kinds of animals.C:be a warning signal for human beings.D:be a good sign for human beings.

  查看答案

• 下面是某位教师进行“生长素的发现”一节教学时，关于达尔文实验的教学片段。

  “生长素的发现——达尔文实验”的教学片段师：植物的向光性是一个普遍存在的生物学现象。最早对这个实验现象进行研究的人是达尔文，他以金丝雀籙草的胚芽鞘作为实验材料进行了实验（展示实验过程示意图）。在这个实验中，变量是什么？生：光照。师：自变量是单侧光。谁来描述一下实验现象？生：黑暗条件下，胚芽鞘竖直向上生长；而单侧光照下，胚芽鞘向光弯曲生长。师：通过这个实验，能得到什么结论呢？生：胚芽鞘的生长与单侧光是有关系的。……在该教学片段中，教学的主要意图是（）。
  A.帮助学生理解科学研究是植根于特定文化背景的B.帮助学生理解科学研究的基本设计思路和分析方法C.帮助学生理解科学知识具有暂定性，是不断发展的D.帮助学生理解科学是众多科学家长期共同研究的成果

  查看答案
• Where Have All the Frogs Gone? In the 1980s, scientists around the world began to notice something strange： Frogs were disappearing. More recent research has shown that many kinds of amphibians （两栖动物）are declining or have become extinct. They have been around for a long time — over350 million years. Why are they dying out now? Scientists are seriously concerned about this question. First of all, amphibians are an important source of scientific and medical knowledge. By studying amphibians, scientists have learned about new substances that could be very useful for treating human diseases.Further research could lead to many more discoveries, but that will be impossible if the amphibians disappear. The most serious aspect of amphibian loss, however, goes beyond the amphibians themselves. Scientists are beginning to think about what amphibian decline means for the planet as a whole. If the earth is becoming unlivable for amphibians, is it also becoming unlivable for other kinds of animals and human beings as well? Scientists now believe that amphibian decline is due to several environmental factors. One of these factors is the destruction of habitat, the natural area where an animal lives. Amphibians are very sensitive to changes in their habitat. If they cannot find the right conditions, they will not lay their eggs. These days, as wild areas are covered with houses, roads, farms, or factories, many kinds of amphibians are no longer laying eggs. For example, the arroyo toad （蟾蜍）of southern California will only lay its eggs on the sandy bottom of a slow-moving stream. There are very few streams left in southern California, and those streams are often muddy because of building projects. Notsurprisingly, the arroyo toad is now in danger of extinction. There are a number of other factors in amphibian decline. Pollution is one of them. In many industrial areas, air pollution has poisoned the rain, which then falls on ponds and kills the frogs and toads that live there. In farming areas, the heavy use of chemicals on crops has also killed off amphibians. Another factor is that air pollution has led to increased levels of ultraviolet (UV) light. This endangers amphibians, which seem to be especially sensitive to UV light. And finally, scientists have discovered a new disease that seems to be killing many species of amphibians in different parts of the world. All these reasons for the disappearance of amphibians are also good reasons for more general concern. The destruction of land, the pollution of the air and the water, the changes in our atmosphere, the spread of diseases — these factors affect human beings, too. Amphibians are especially sensitive to environmental change. Perhaps they are like the canary（金丝雀） bird that coal miners once used to take down into the mines to detect poisonous gases. When the canary became ill or died, the miners knew that dangerous gases were near and their own lives were in danger.Scientists think that the decline of amphibians could A cause environmental change.B cause a decline in other kinds of animals.C be a warning signal for human beings.D be a good sign for human beings.

  查看答案

• 根据所给材料设计活动方案

  要求：1.设计应符合语言教育目标和幼儿年龄发展特点;2.任意选择一种活动类型设计相应的活动方案，可提炼“材料2"主题设计谈话活动或听说游戏方案，可围绕“材料2”设计讲述活动、文学作品学习活动或早期阅读;3.活动方案门方案结构完整，包含活动目标、活动准备、活动过程等内容;4.按照活动设计与实施的步骤列出活动过程每一环节的要点.

  材料1：中班幼儿语言教育目标

  （1)谈话活动：能集中注意力，耐心倾听别人谈话不打断别人的话乐意与同伴交流，能大方地在集体面前说话能说普通话，较连贯地表达自己的意思学会围绕一定的话题谈话，不跑题;学会用轮流的方式谈话，不抢着讲，不乱插嘴继续学习交往语言，提高语言交往能力。

  （2)讲述活动：养成先仔细观察，后表达讲述的习惯;逐步学会理解图片和情景中展示的事件顺序;能主动地在集体面前讲述，声音响亮，句式完整;学习按照一定的顺序讲述实物、图片和情景的内容能积极地倾听别人的讲述内容，发现异同，并从中学习好的讲述方法。

  （3)听说游戏：在游戏中巩固练习发音，正确运用代词、方位词、副词、动词、连词和介词等能说简单而完整的合成句;能听懂并理解多重游戏规则;学习较迅速地领悟游戏中的语言规则，并能及时作出相应的反应。

  （4)文学作品：学习活动喜欢不同形式的文学作品，主动积极地参加文学活动;知道文学作品语言与日常生活语言的不同进一步感受文学作品的语言美;学习理解文学作品的人物形象感受作品的情感基调，能运用较恰当的语言、动作、绘画形式表现自己的理解;能根据文学作品提供的线索，扩展想象，仿编或续编一个情节或一个画面。

  （5)早期阅读：能仔细观察图画书画面的人物清节、看懂单页多幅的儿童图画书的内容，增强预知故事情节发展和结局的能力懂得爱护图书，知道图书的构成，有兴趣模仿制作图画书在阅读过程中初步了解汉字的由来和汉字认读的规律，并有主动探索汉字的愿望;喜欢描画图形，尝试用有趣的方式练习汉字的笔画。

  材料2：妈妈的最爱

  小女孩说：“兔子先生，帮帮忙好吗？我想送妈妈个她喜欢的东西。”

  “妈妈喜欢的东西？噢，那一定是个好礼物。”

  “妈妈喜欢红色。”小女孩说。

  “红色？又不能送‘红色’给你妈妈。”兔子先生沉思着说，“如果是红色的东西呢？比如，红色的小鸟。”

  “不行，不行，妈妈喜欢小鸟停在树上。”

  “红色的消防车呢？"

  “不行，不行，妈妈不会喜欢红色的消防车!"

  “那，送草莓好了”

  “那个好，妈妈最喜欢草莓了。”

  “可是，我还想再送点别的像黄色的东西。”

  “恩……金丝雀的黄色的!”兔子先生说

  “妈妈喜欢小鸟停在树上。”

  “那，奶油是黄色的，妈妈喜欢奶油吗？”

  “我们家已经有奶油了。”

  “香蕉是黄色的。”

  “对了，这个好。妈妈最喜欢香蕉了。”

  “可是，我还想送点别的。”

  ‘你妈妈喜欢什么呢？”

  “妈妈喜欢绿色。”

  “送翡翠给你妈妈吧!这会是一份很棒的礼物。”

  “翡翠太贵，我买不起。”

  “豌豆和菠菜呢？豌豆的绿色的，菠菜也是绿色的。”

  “不行，我们家晚餐都吃这个。”

  “苹果呢？青苹果好吗？”

  “就这个，这个最好了."

  “你看，有草莓、香蕉和青苹果。可是，我还没有篮子。”

  “我有篮子.”兔子先生说。

  小女孩接过篮子，把红色的草莓、黄色的香蕉、绿色的苹果放进去。礼物准备好了。

  “兔子先生，谢谢你。”

  “不客气，可以帮你，我也很高兴啊!再见!"

  查看答案