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高中三年级英语

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    Scientists who discovered a new way of generating electricity from water say they may have come across an alternative source of clean energy to rival wind and solar power.
    The breakthrough, which scientists say is the first new way to generate electricity in 160 years, could lead to batteries that use water instead of poisonous substances.
    The scientists made the discovery when they were investigating what happens when tap water is forced through extremely narrow glass tubes. Water squeezed down the tubes, each of which was narrower than a tenth the thickness of a human hair, generating a small electric current that ran the length of the tube. To produce a larger electric current, the team tried forcing water through a glass water filter(滤水器)that contained thousands of narrow channels lined up side by side. “When we took a syringe(注射器)of water and squeezed it through the filter, we got enough power to light a light bulb,” said Larry Kostiuk of the University of Alberta in Canada. “The harder you push the syringe, the more electric current you get.”
    The current is produced because of an effect in the glass tubes. When they are filled with water, positively charged ions(阳离子)fixed in the tubes are washed away, leaving a slight negative charge on the glass surface. When water is then forced along the tube, the surface repels negatively charged ions in the water while positively charged ions are attracted down the tube. The result is a net flow of positively charged ions that sets up an electric current.
    According to Dr Kostiuk, no one has ever thought to use water to produce electricity in this way. “The last time someone came up with a way of generating electricity was Michael Faraday in 1839,” he said. “So this is the first new way of generating electricity in 160 years, which is why we are so excited about it.”
    Dr Kostiuk says water batteries might one day be used to power mobile phones and calculators, but admitted that the engineering challenges might make other applications more realistic. “You’d need to be sure it wouldn’t leak, and you’d need to make sure it wouldn’t freeze,” he said.
    More likely would be to install the electricity-generating devices where water is already being pumped, such as at city water filtration sites, he said. “It could compete with wind and solar power,” he added.
    小题1:What does the passage mainly want to tell us about?
    A.A kind of solar power discovered by scientists.
    B.A kind of new energy source found in tap water.
    C.The breakthrough to generate electricity 160 yeas ago.
    D.A kind of new battery invented without poisonous substances.
    小题2:The underlined word “repels” in Paragraph 4 is closest in meaning to _________.
    A.rejectsB.identifiesC.attractsD.rebels
    小题3:Why were the scientists extremely happy about their new discovery?
    A.They were the first to find a new way to produce electricity.
    B.They could make an electric current to light a light bulb.
    C.Their discovery could be used to invent water batteries.
    D.Their discovery was made 160 years earlier than Faraday’s.
    小题4:What can we infer about potential water batteries?
    A.They must be used to power mobile phones and calculators.
    B.They have some possible disadvantages like water leaking.
    C.They would be needed greatly at city water filtration sites.
    D.They would be better than wind and solar power.

    本题信息:英语阅读理解难度较难 来源:未知
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本试题 “Scientists who discovered a new way of generating electricity from water say they may have come across an alternative source of clean energy to riv...” 主要考查您对

科教类阅读

等考点的理解。关于这些考点您可以点击下面的选项卡查看详细档案。
  • 科教类阅读

科教类阅读的概念:

科教类阅读主要考查考生对书面语篇的整体领悟能力和接受及处理具体信息的能力。试题的取材,密切联系当前我国和世界经济、科技等方面的变化,有关数据的来源真实可信。


科教类文章阅读技巧:

一、材料特点:

这类文章的总体特点是:科技词汇多,句子结构复杂,理论性强,逻辑严谨。具体说来它有以下几个特点: 
1、文章中词汇的意义比较单一、稳定、简明,不带感情色彩,具有单一性和准确性的特点。这类文章通常不会出现文学英语中采用的排比、比喻、夸张等修辞手法,一词多义的现象也不多见。 
2、句子结构较复杂,语法分析较困难。为了描述一个客观事物,严密地表达自己的思想,作者经常会使用集多种语法现象于一体的长句。 
3、常使用被动语态,尤其是一些惯用被动句式。

二、命题特点:

科普类阅读的主要命题形式有事实细节题、词义猜测题、推理判断题以及主旨概括题等,其中推理判断题居多。

三、应对策略:

1、要想做好科普英语阅读理解题,同学们就要注意平时多读科普知识类文章,学习科普知识,积累常见的科普词汇,从根本上提高科普英语的阅读能力。
2、要熟悉科普类文章的结构特点。科普类文章一般由标题(Head line),导语(Introduction),背景(Back ground),主体(Main body)和结尾(End)五部分构成。标题是文章中心思想高度而又精辟的概括,但根据历年的高考情况来看,这类阅读理解材料一般不给标题,而要同学们选择标题。导语一般位于整篇文章的首段。背景交待一个事实的起因。主体则对导语概括的事实进行详细叙述,这一部分命题往往最多,因此,阅读时,同学们要把这部分作为重点。结尾往往也是中心思想的概括,并与导语相呼应,命题者常在此要设计一道推理判断题。  
3、在进行推理判断时,同学们一定要以阅读材料所提供的科学事实为依据,同时所得出的结论还应符合基本的科普常识。


科普类阅读应试策略:

命题趋势
阅读理解题主要考查考生对书面语篇的整体领悟能力和接受及处理具体信息的能力。试题的取材,密切联系当前我国和世界经济、科技等方面的变化,有关数据的来源真实可信。因此科普知识类文章是每年的必考题。分析历年的科普类文章我们不难发现以下特点:
1、文章逻辑性强,条理清楚,语法结构简单,用语通俗。
2、文章内容注重科技领域的新发现。内容新颖,从而使文章显得陌生,内容抽象复杂。
3、命题方面注意对具体细节的准确理解和以之为依据的推理判断。
4、以人们的日常行为或饮食健康入手,探讨利弊,诠释过程,阐述概念。
应试对策
许多考生在考试时感到困惑的是:为什么一些没有超越中学语法和词汇范围的篇章,读起来却不能正确理解,或者要花费很多时间才能读懂呢?这种现象的产生与阅读方法有很大的关系。例如,有的考生在考试时一见到文章就立刻开始读,结果读了半天,还不知道短文讲的是什么,试题要求了些什么,结果浪费了大量的时间,而阅读效果并不好。那么,怎样读效果才好呢?任何一种阅读方法或技巧的使用,都是由篇章特点和试题本身的要求决定的,应根据不同的体裁和试题要求采取不同的策略。
1、浏览。浏览的主要目的就是确定文章的体裁。如果文章属于人物传记、记叙文、故事、科普小品和有关社会文化、文史知识的文章,一般来说,应该先看看文章的试题考查内容,对题目类型做到心中有数,针对不同问题,在通读时有粗有细地去阅读,这样不仅能把握篇章的基本结构和逻辑线索,也能做好有关具体事实信息考查的试题。
2、挖掘寓意,掌握中心思想,推出结论。任何文章,作者在行文时都有一定的写作目的和主要话题。在通读篇章时应该吃透作者的写作意图,抓住文章的主题句,充分发挥自己的想象力和概括力,作出对中心思想的归纳和结论的推断。
3、把握篇章结构,利用上下文进行推测。高考中的阅读理解篇章往往是一个较完整的短文,其结构、思想,前后上下连贯统一。考试时应充分利用这一特点推测一些生词、短语在句中的含义,切莫盲目孤立猜测。
4、综观全篇,前后呼应。这是阅读理解的最后一步,在做完阅读理解题后,要立足于文章整体,再迅速读一遍短文,短文中的问题和答案的设置前后都是相关联的,有着一定的连续性,体现着文章的基本脉络。