小题1: ________In 1973, Jimmy Carter, ex-president of the United States,,高中一年级,英语试题,序数词考点,好技网

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小题1: ________
In 1973, Jimmy Carter, ex-president of the United States, saw a UFO—an Unidentified Flying Object. There were about 20 other people with him at the time, and they all watched the strange object for several minutes.
小题2: ________
Does this surprise you? It’s not unusual. About 15 million people all over the world think that they have seen a UFO, a recent report says.
小题3:_______
UFOs have become very popular. There are books and films about UFOs, we can watch imaginary flying saucers and visitors from space on television, and there are stories in the newspapers about strange objects. Some of the stories are very silly. Clearly, some of these “UFOs” were aircraft, birds, the moon, lights on the clouds, and so on. But some people believe that spaceships come from other planets, and some of the reports aren’t easy to explain.
小题4: ______
In 1947 an American businessman was flying his own plane during the day. Mr. Arnold was a sensible man and a pilot with many years’ experience. That day, he saw a row of strange flying objects. He could see them clearly, and he watched them for some time. Later he said that they moved “like saucers over water.” The name “flying saucer” was invented. The newspapers loved the story, of course, and they all wrote long reports about it.
小题5: ______
During World War II, pilots had reported strange round flying objects. Sometimes these objects flew beside their planes and followed them. At first, the pilots were afraid: they thought these objects were a new weapon. But the “weapon” didn’t harm them. The officers said the pilots were imaging things. The pilots got used to the strange objects.

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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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