题目内容

Look! There is ________ eraser on the desk.


  1. A.
    a
  2. B.
    an
  3. C.
    the
  4. D.
    /
B
试题分析:句意:看,桌子上有一块橡皮.结合语境可知本句中泛指任何一块橡皮.故用不定冠词.eraser词首音素是元音,故不定冠词用an,选B.
考点:冠词
点评:冠词是一种虚词,一般用于名词前面表示特指或者泛指某一个。冠词的应用都用一定规则,熟记这些规则是解题的关键。不定冠词用在名词前,表示泛指任何一个。定冠词用在名词前表示特指某一个。在专有名词及表示泛指的复数名词前一般不要冠词,叫做零冠词。需注意的是不定冠词的用法是看词首音素,不是看首字母,如:useful首字母是元音,但是词首音素时辅音,故不定冠词用a;hour首字母是辅音,但是词首音素是元音,故用冠词an。
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  In summer, the green chlorophyll is very, very busy. It makes food for the trees. It catches sunlight to change water and carbon dioxide(二氧化碳)into sugar. This sugar is the food for ther tree. It is so busy that it covers up all of the other colours in the leaf.

  When the weather grows colder in autumn, there is less light and water for trees. The trees will have a rest to get ready for winter. They've made enough food in summer! The leaves no longer need water to make food. Without the water, the green chlorophyll starts to go away. The other colours in the leaf-the yellow xanthophylls and orange carotene come out. So the leaves don't reallyturna certain colour. They just lose their green !

  But how about the red, purple and green leaves?

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(1) The tree leaves have the following colourbags, such as green, yellow and orange except red.

(  )

(2) In summer, the green chlorophyll works hard for the tree leaves.

(  )

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(5) We can infer(推断)from the article that trees can clean the air.

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