试题与答案

染色翡翠在()滤色镜下变红或变粉红。

题型:填空题

题目:

染色翡翠在()滤色镜下变红或变粉红。

答案:

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参考答案:E

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 阅读理解。 
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     One day the teacher asked the students a question, "When John was ten years old, his brother
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     Mr. Green answered, "That's easy.  His brother is twice as old as John, so he is now thirty."
     Another time, the teacher in a science class asked, "When it thunders, why do we always see the
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     The third time,   the teacher in a biology class asked, "Why can fish swim in the water?  But, Miss
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1. Mr. Green was _____ when he was young.
    A. strong      
    B. lazy    
    C. clever    
2. Mr. Green _____ when he was a student.
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    C. did a lot of housework
    D. learned science and biology very well
3. How old is John's brother when John is fifteen in the teacher's question?
    A. Ten years old.
    B. Fifteen years old.
    C. Twenty years old.
    D. Twenty-five years old.
4. According to (根据) Mr. Green, when it thunders,   we always see the light before we hear the sound 
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    A. our eyes are in front of our ears
    B. our eyes are cleverer than our ears
    C. our eyes can see but our ears can't
    D. light goes faster than sound
5. Why can fish swim in the water? Mr. Green's answer was _____.
    A. fish can't walk on land
    B. fish can't swim on land
    C. fish can't walk in the water
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题型:单项选择题

美国科研人员做过这样的实验:将一只青蛙放到沸水中,青蛙触电般立即窜逃出去;又将青蛙放人凉水中,然后用小火慢慢加热,青蛙虽然可以感觉到温度的变化,却没有立即跳出去而逐渐丧失逃生能力。这种现象被称为“青蛙效应”。“青蛙效应”说明的关于事物发展状态的哲理是()

①事物变化发展的实质是引起质变的量变

②事物的质变是由渐进的量变引起的

③事物的质变就发生在无形的量变之中

④事物的不显著的量变可以向质变转化

A.①②

B.①③

C.②④

D.③④

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