注意：每空不超过3个单词。Frederick M. Hess is the director of education policy stu,高中二年级,英语试题,序数词考点,好技网

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注意：每空不超过3个单词。
Frederick M. Hess is the director of education policy studies in American. He says that a long summer vacation doesn't make sense in today's world.
In a summer vacation, millions of kids spend valuable time sending messages, watching TV, playing video games and doing shopping in the mall. These activities are putting their futures at risk.
Summer vacation once made sense in the past when you didn't need an education to get a good job. But now things have changed. For today's students, academic(学术的) skills are important to students' future success, but such skills are affected in the summertime. Most American schools offer up to thirteen weeks summer vacation.
Summer vacation also causes challenges for today's families. In the 1960s, more than 60% of families had a stay-at-home Mom. Now two-thirds of American children live in households where every adult works. For these families, summer vacation can be more burden than break. Someone must watch the kids.
“A longer school year does not have to be hard and boring work. Instead, it should allow teachers to give richer and more imaginative lessons,” Frederick M. Hess suggested, “Schools would have more time to devote to athletics, languages, music and the arts”.
Summer vacation can be a grand thing. But in the 21st century, it may also be outdated.
Title: Long Summer Vacation

Theme	A 小题1: doesn’t make sense in today’s world.
Basic Information	Vacation length	小题2: weeks in most American schools
	Students’ 小题3:___________	·Sending messages and watching TV ·Playing video games ·Doing shopping
Disadvantages	Putting student’s academic futures at risk	Affect academic 小题4:
	Causing challenges for families	Make parents watch kids at home
小题5:___________	Students should study more imaginative lessons such as athletics, languages, music and the arts.
Conclusion	Summer vacation can be both grand and outdated

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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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