Directions: Read the following passage. Answer the questions according,高中二年级,英语试题,序数词考点,好技网

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Directions: Read the following passage. Answer the questions according to the information given in the passage.
Energy drinks are now available (可购得的) in nearly every store and they promise to make people feel more energetic and think more clearly. these products have names like Red Bull , Monster, 5-Hour Energy and so on, which appeal mainly to young adults and teenagers.
Chad is a medical researcher who got interested in studying energy drinks because of the explosion (猛增) in their popularing in the last few years.He says he and his research team have found three major things about energy drinks. One: there are huandreds of brands of energy drinks in most major countries. Two: the drinks are not clearly labeled (用标签标明) with enough information such as what are contained in the drink, the date and even t names of their makers. And three: the amount of caffeine ( 加啡因) varies greatly. Some contain as little as fifty milligrams, others as much as five hundred.
Some energy drinks contain a mixture of ingredients (配料) listed as an “energy blend”. But scientists do not know a lot about them and how they interact with each other. These ingredients may be dangerous for people who drink them. What is worse , he says, there is no listing of the amount of each ingredient. Some makers of energy drinks do provide warnings. For example, a popular energy drink warns against use by people who are nursing a baby or under the age of twelve.
Chad and his team suggest labeling energy drinks with the amount of caffeine and other ingredients clearly in order to protect the health of the public. And the government officials are considering their suggestions now.
1. What do the energy drinks promise to do? (no more than 10 words)
______________________________________________________________
2. Why did Chad get interested in studying energy drinks? (no more than12 words)
_______________________________________________________________
3. Who are the main users of energy drinks? (no more than5 words)
_______________________________________________________________
4. Please explain the underlined word “interact” in English. (no more than8 words)

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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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