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    请认真阅读下面短文,并根据所读内容在文章后的空格内填入最恰当的单词. 每空格1个单词，不得用文章中的单词。
    A scientist once said that studying the stars from the earth is something like looking up at the sky from the bottom of a swimming pool. Even on the clearest night the earth’s dense atmosphere will dim stars in the sky as it screens out (遮挡) 30 percent of their light. Air turbulence (湍流) causes stars to winkle. Through a telescope, the stars seem to jump around dizzily.
    Because the moon has no atmosphere, astronomers are looking forward to setting up an observatory there. On the moon, there will be no clouds to obscure the view. The sky will appear dark at all times, so astronomers can work twenty-four hours a day. Because there is not air turbulence, the stars will steady through a telescope.
    Because the moon is relatively near the earth, moon-based astronomers will see the stars in familiar patterns known on earth. They will not need new star maps of the sky. Stars seen from the moon will appear to move very slowly. Because the earth rotates (自转) on its axis once every twenty-four hours, earth-based astronomers see the stars hurry across the sky each night. The moon rotates on its axis only once a month. To astronomers on the moon, the stars will appear to stand almost still. Moon-based astronomers will have much more time to focus their telescopes and take time ---exposure photographs.
    On the earth, man-made radio noises jam the airwaves and interfere with the reception of radio signals from certain stars. A radio telescope located on the far side of the moon will be permanently protected from such interference.
    It won’t be easy to put telescopes on the moon. However, astronomers are certain the job can be done. They are convinced that the moon is an ideal place to set up an observatory.
    Title : The Reasons for establishing an observatory on the moon
    Main Comparison
    		Context
    Different   小题1: 
    		There is very  小题2: atmosphere on the moon.
    On the earth, air turbulence causes stars to twinkle like  小题3: .
    Different   小题4: 
    		On the moon, the sky will seem to be in   小题5: .
    Because of clouds, there is a  小题6:  view from the earth.
    Different   小题7: 
    		Earth-based astronomers see stars move very  小题8: 
    Stars are seen on the moon to move at a very low   小题9:  
    In contrast
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    • 本试题 “请认真阅读下面短文,并根据所读内容在文章后的空格内填入最恰当的单词. 每空格1个单词，不得用文章中的单词。A scientist once said that studying the stars...” 主要考查您对

    序数词

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    • 序数词

    序数词的概念：

    表示顺序的数称为序数词。如：first, second, third, fourth。


    序数词的构成与用法：

    1、序数词的构成：
    ①一般来说，是由相应的基数词加词尾th构成。
       例：four＋th→fourth
               six＋th→sixth
               seven＋th→seventh
               ten＋th→tenth
    ②下面这些基数词在变为序数词时，有特殊的变化。
    例：one→first
            two→second
            three→third
            five→fifth
            eight→eighth
            nine→ninth
            twelve→twelfth
    ③十位整数序数词的构成方法是将基数词的词y变成i，然后再加eth。
    例：twenty→twentieth
            thirty→thirtieth
            forty→fortieth
            ninety→ninetieth
    ④两位或两位以上的基数词变成序数词时，仅将个位数变成序数词。
    例：twenty－one→twenty－first
            thirty－five→thirty－fifth
            a hundred and fifty－three→a hundred and fifty－third

    2、序数词的用法：
    ①序数词在使用时，一般加上定冠词。
    例：the first book
            the second floor
            the third day
            the fourth week．
    ②序数词在多数情况下都用作定语，有的也可以作表语、主语和宾语。
    例：The may1st is Labour Day. 五月一日是劳动节。
            My room is on the second floor. 我的房间在二楼。
            The first is larger than the secon.（主语）第一个比第二个大。
            Read the book from the first.（宾语）从开头读这本书。
            You'll be the sixth to write.（表语）你将是第六个写的。
    ③序数词的前面可以加上不定冠词，用来表示“再一”，“又一”的意思。
    例：You may have a third try. 你可以第三次尝试。


    序数词知识体系：

     


    约数的表达方法：

    用tens/dozens/scores/hundreds/thousands/millions of 表示“几十、几百、上千、成千上万”等。
    如：The boy bought dozens of pencils.            
            Thousands of people died in the earthquake.
    注意： (A)：dozen, score, hundred, thousand, million等表示确切数量时，不用复数。
    如：five dozen (of) eggs   五打鸡蛋
            hree hundred people  三百个人

    分数词的构成和用法：

    1）分数词构成法：
    分数词（FractionalNumerals）由基数词和序数词构成，基数词代表分子，序数词代表分母。除了分子为1的情况下，序数词都要用复数形式：
    如：1/4：one-fourth
            5/9：five-ninths
            2/3：two-thirds
           17/5：three and two-fifths
           7/12：seven-twelfths
           379/8：forty-seven and three-eighths
    此外还有下面表示法：
    如：1/2：a(one) half
            1/4：a(one) quarter
            3/4：three-quarters
            9/4：two and a quarter
            3/2：one and half
            31/4：seven and three quarters


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