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高中三年级英语

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    根据短文内容,从短文后的选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。
    In many parts of the world, cars play an important role in daily life and many societies would not exist without them.  1  But this is the prediction made by a team of transport researchers who are taken seriously, not only by government but also by car manufacturers.
    The Human Science and Advanced Technology Institute at Loughborough in the UK is part of an international research program.  2  That will mean much saving, no accidents and better use of roads. The super-intelligent car in the future will drive itself.  3  Instead, we will have a choice of cars and change them as frequently as we change our clothing.
    According to Dr. David Davis, who leads the research team, these predictions are based on the rising cost of the car culture, which had blocked up our cities, polluted our air, and caused more deaths than both world wars put together.
    Davis says, cars will be fitted with some intelligent devices(装置) to regulate(调节) the distance between one car and another.  4  computers are much safer drivers than people, so cars in a road train will be able to drive much closer together than cars driven by people.
    By 2010, Dr. David Davis believes, car technology will give motorists a clear view of the road, whatever the weather conditions, by projecting an image of the road ahead on to the car’s windscreen.  5  Cars will be connected by an electronic tow bar to the car in front to form “road-trains”. “The front vehicle in such a train burns the normal amount.” says Davis. “but all the others in the train would burn about ten percent of the normal amount,  and so produce about ten percent of the pollution.”
    A.The team there believes that by 2030 all cars will be computerized.
    B.They believe that cars will become more important in 20 years.
    C.And it will not be owned by one individual.
    D.And by 2030, cars will travel in line, linked to each other electronically.
    E. So the idea that in 20 years’ time, no one will own cars may be hard to believe.
    F. Every driver will use less fuel in the car he owns.
    G. The car will automatically speed up, or slow down, to match the speed of the car in front.

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本试题 “根据短文内容,从短文后的选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。In many parts of the world, cars play an important role in daily ...” 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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