数词--分数词

http://www.sina.com.cn 2007年09月11日 16:19   北文图书

  分数词

  1. 表示“几分之几”的词称为分数词。分数词是由基数词和序数词合成的,基数词代表分子,序数词表示分母,除分子为1的情况外,序数词都用复数:

  one-fourth two-thirds three-fifths 1 one and three-fourths

  另外还有下面表示法:

  a(one)half a(one)quarter

  three-quarters 2 two and a quarter

  2. 分数词在句中可用作:

  1)主语:

  A quarter of the students are girls. 四分之一的学生为女生。

  Over nine-tenths of China’s inhabitants belong to the Han nationality. 中国居民十分之九以上为汉族人。

  2)宾语或介词宾语:

  They used one-fifth of the money for capital construction. 他们用五分之一的钱进行基本建设。

  They account for one sixth of the population. 他们占人口的六分之一。

  3)同位语或表语:

  Some 565 million people, about two-fifths of our population, live in this area. 约占我国人口五分之二的五亿六千五百万人居住在这个地区。

  The crop of that year was only one-third of the usual amount. 这年的收成只是正常年产量的三分之一。

  4)偶作定语(a)或状语(b):

  a. It’s one-twentieth the thickness of a human hair. 它只有人头发丝的二十分之一。

  b. China is one-sixth larger than the United States. 中国比美国大六分之一。

  Exercises:

  I. 在下面句子中的分数词下划线:

  1. Half of six is three.

  2. She saved half of it.

  3. Forests cover three quarters of the land.

  4. The moon is about a quarter the size of the Earth.

  5. There is a quarter of a million dollars in his account.

  6. Nearly one fourth of Poland is covered by forests.

  7. Africa’s area is one fifth of all the land on the earth.

  8. At least a ninth of the children are ill.

  9. Less than one twentieth of its total land area is used for growing crops.

  10. The mass of an electron is 1/1850 that of a hydrogen atom.

  11. It produces powers at 1/8th the cost in a thermal power plant.

  12. Chips use very little power — less than 1/100th of a light bulb.

  II. 读出下面词组,并给出汉语意思:

  1. half a year

  2. an hour and a half

  3. a quarter past two

  4. three quarters past eleven

  5. a quarter of an hour

  6. three-fifths of the land

  7. a(one)tenth of the students

  8. two and a quarter miles

  9. seven-tenths of the inhabitants

  10. half(of)my earnings

  11. one-fourth of her salary

  12. three-eighths of its members

  13. seven-tenths of its surface

  14. a(one)millionth of a second

  15. a(one)hundredth part of a gram

  16. a 1000th of a litre

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