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高中三年级英语

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    Rabbits are easy to raise. The long-eared animals are clean and quiet. They do not need a lot of room. And you do not have to spend a lot of money to feed them.   小题1: 
    One male and two females will produce in a year as many as fifty more rabbits. That is enough to provide a good supply of meat for a family. 小题2: 
    Rabbit houses are easy to make with wood and wire fencing material. They do not have to be very big. But each rabbit must have its own little room in the house. This is very important. Each room should be about 75 centimeters wide, 60 centimeters high and one meter deep. Fencing is used for the sides and floor of the rabbit house. The holes in the wire fencing should be about one centimeter square.   小题3:  This keeps the rabbit house clean and dry. Rabbits need a lot of fresh air and sunlight. Cover the sides of the rabbit house only to protect it from rain.
     小题4:   Feeding containers hung on the outside of the house let the rabbits eat whenever they want. They simply pull the grass and leaves through the holes in the wire fence.
    Each room should have fresh water. The water containers should be heavy so the rabbits cannot turn them over.    小题5:  
    One month after mating, female rabbits give birth to about eight babies. In two months, a baby rabbit should weigh about two kilograms. This is big enough to make a meal for a small family.
    A.Rabbits eat mostly grass and leaves.
    B.Rabbits are also valuable for their fur.
    C.Or you can tie the containers to the wire.
    D.Rabbit meat is high in protein and low in fat.
    E. Many people enjoy keeping rabbits as friendly pets.
    F. Wastes from the animals will drop through the holes.
    G. With rabbits, you get a big return from a small investment.

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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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