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    融化 【查看更多】

     

    题目列表(包括答案和解析)

    　　Terrible weather, melting (融化的) snow and gathering clouds may be signs of global warming．The average temperature on Earth for last year was the second warmest since written records began 140 years ago．

    　　“The global average surface temperature in 2001 was 14．42 degrees centigrade,”the World Meteorological Organization (WMO世界气象组织) said．The record, set in 1998, was 14．58 degrees centigrade．

    　　“Temperatures are getting hotter, and they are getting hotter faster now than at any time in the past,” said Michel Jarraud, a WMO official．

    　　Carbon dioxide (二氧化碳) produced from burning fuels is the most common of the so-called greenhouse gases．The growing concentration (集中) in the atmosphere of these gases is thought to be warming the Earth．“Most of the causes of global warming are due to human action,” said Ken Davidson, director of WMO's climate programme department．

    　　Every year, large amounts of gases produced by factories, cars and burning trees hold in too much heat and cause global warming．Many scientists believe the warming, if not stopped, will cause extreme climate changes this century．

    　　Throughout the world, the spreading of particular diseases and other threats (威胁) to human health depend largely on local climates．Extreme temperatures can directly cause loss of life．Warm temperatures can increase air and water pollution, which in turn can harm human health．

    　　In the Earth's atmosphere there are tiny amounts of gases called greenhouse gases．These gases hold in the heat that comes up from the sun-warmed Earth．As cities have increased in size and population, factories and industries in the world have grown．People need more and more electricity, cars and other things．So more greenhouse gases have been added to the atmosphere．This causes more heat to be trapped than in the past．This is called the greenhouse effect．

    1．The subject discussed in the passage is________．

    [　　]

    A．the growing population of the world

    B．the global average surface temperature

    C．the increasing greenhouse effect

    D．the causes of air and water pollution

    2．According to a WMO official, it is________ that should be blamed for global warming．

    [　　]

    A．modern factories

    B．human activities

    C．carbon dioxide

    D．burning fuels

    3．The rising of the earth temperature will finally result in ________．

    [　　]

    A．the spreading of particular diseases

    B．air and water pollution

    C．extreme climate changes

    D．all of the above

    4．Which of the following is TRUE according to the passage?

    [　　]

    A．Air and water pollution is caused by global warming．

    B．Greenhouse gases do no good to human beings．

    C．With the air getting hotter, people need more and more electricity, cars and other things．

    D．The average temperature on Earth for 1998 was the warmest according to written records．

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    阅读理解
                                                                    
                                                                  The Scientific Method
         Did you ever wonder why the water level in a glass doesn't change when the ice in the glass melts
    (融化)? To find out why, you can use the scientific method. Used by scientists in various situations, the
    scientific method is also a clear and logical way to solve many real-world problems, as the procedure
    below indicates.
    Steps in the Scientific Method Examples
    State the problem or question. "Why doesn't the water level in a glass rise when ice melts?"
    Collect information about the problem,
    using  your own observations and
    research.    		 You already know that ice is frozen water. From your research,
    you learn that water and ice are made of water molecules (分子).
    "Form a hypothesis, or a best guess
    based on the information."    		 The molecules in water appear to be closer together
    than they are in ice.
    Test the hypothesis by doing an
    experiment.    		 Fill four glasses with ice. Then pour water over the ice and fill
    each glass to the rim. As the ice melts, you observe that the water
    does not spill over the top of the glasses. Each time you repeat the
    experiment, you get the same results.
    Draw a conclusion based on your results. Molecules are closer together in water than they are in ice.
      
    1. We all know the fact that        .
    A. the water level in a glass doesn't change when the ice in the glass melts
    B. the water level in a glass changes when the ice in the glass melts
    C. the water level in a glass rises when the ice in the glass melts
    D. the water level in a glass goes down when the ice in the glass melts
    2. Which of the following is another good title for this passage?
    A. Research and Conclusion            
    B. Observation and Experiment
    C. Follow the Steps to Find Out Why      
    D. Mix Water with Ice and Get the Result
    3. A hypothesis is _______.
    A. a guess about the cause of something    
    B. the first step in the scientific method
    C. a conclusion about water molecules    
    D. an experiment on ice and water
    4. This passage suggests that _______.
    A. repeated experiments lead to the right result  
    B. research should be done in various situations
    C. your hypothesis can prove your experiment results
    D. a logical method is needed when solving problems
    5. The chart in the passage is useful because it _______.
    A. shows a diagram of how ice melts    
    B. shows steps and examples
    C. compares water with ice            
    D. explains cause and effect

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    阅读理解。
                                                               The Scientific Method
          Did you ever wonder why the water level in a glass doesn't change when the ice in the glass melts (融化)?
    To find out why, you can use the scientific method. Used by scientists in various situations, the scientific
    method is also a clear and logical way to solve many real-world problems, as the procedure below indicates.
    Steps in the Scientific
    Method    		 Examples
    State the problem or
    question.    		 "Why doesn't the water level in a glass rise when ice melts?"
    Collect information about the problem,
    using your own
    observations and
    research.     		You already know that ice is frozen water. From your research,
    you learn that water and ice are made of water molecules (分子).
    Form a hypothesis,
    or a best
    guess based on the
    information.     		"The molecules in water appear to be closer together than they are
    in ice."
    Test the hypothesis by doing an experiment. Fill four glasses with ice. Then pour water over the ice and fill
    each glass to the rim. As the ice melts, you observe that the water
    does not spill over the top of the glasses. Each time you repeat the experiment, you get the same results.
    Draw a conclusion
    based on your
    results.     		Molecules are closer together in water than they are in ice.
    1. Which of the following is another good title for this passage?
    A. Research and Conclusion
    B. Observation and Experiment
    C. Follow the Steps to Find Out Why
    D. Mix Water with Ice and Get the Result
    2. A hypothesis is _______.
    A. a guess about the cause of something
    B. the first step in the scientific method
    C. a conclusion about water molecules
    D. an experiment on ice and water
    3. This passage suggests that _______.
    A. repeated experiments lead to the right result
    B. research should be done in various situations
    C. your hypothesis can prove your experiment results
    D. a logical method is needed when solving problems
    4. The chart in the passage is useful because it _______.
    A. shows a diagram of how ice melts
    B. shows steps and examples
    C. compares water with ice
    D. explains cause and effect

    查看答案和解析>>

    写作训练(Writing Training)

    根据要求写一篇短文：

    标题：Music and Multiculture音乐与多元文化

    提示与要求：

    1．字数100左右．

    2．不同民族、不同音乐、不同文化的民族化(nationalization)．

    3．多种音乐、多种文化融合后的全球化(globalization)．

    4．音乐是世界人民互相学习、相互理解的媒介之一．

    5．音乐也是人们学会相互欣赏、相互沟通的手段之一．

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    请根据下面的内容提示，用英语写一篇物理实验报告。

    实验目的：证明冰融化过程中温度不变

    实验用品：冰块，大小烧杯，温度计，热水

    实验步骤：1.在一个大烧杯中倒入热水；

    2．把装有冰块的小烧杯置入热水中，在冰块中插入温度计；

    3．观察冰块温度变化，注意冰融化开始时的温度；

    4．观察冰融化为水过程中的温度变化。

    实验结果：冰全部融化为水融化过程中温度不变。

    实验结论：冰在零摄氏度时才开始融化，融化过程中温度不变。

    注意：1.词数：100左右；

    2．可适当增加细节，以使行文连贯；

    3．参考词汇：烧杯beaker；温度计thermometer；观察observe。

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