题目内容

Doctors couldn’t say what was wrong ________ they didn’t know what kind of snake it was．


  1. A.
    so
  2. B.
    because
  3. C.
    or
  4. D.
    but
B
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　　Eye doctors in Shanghai found out recently that the nearsightedness（近视）among primary and middle school students has something to do with the color of the paper in their textbooks and notebooks.

　　The doctors suggested that yellow paper should be used to replace the white one.

　　According to their research the experts found out white paper reflects （反射）too much light and easily tires a person's eyes. The yellow paper, however, doesn't look so sharp to a person's eyes. In other words, it is much milder to the eyes of students who may do reading or writing for hours.

　　The experts' research finding were based on first -hand information and a number of scientific experiments（实验）including a recent study among the students from forty-one middle schools. To make the students understand the truth, Shanghai Education Development Co. Ltd has produced textbooks and exercise-books made of yellow paper. The books will be used in the whole city soon.

　　根据短文内容判断正误（正确的填“T”,错误的填“F”）

(1) The passage mainly wants to tell us yellow color is helpful to students' eyes.

(　　)

(2) According to the research, the students' nearsightedness has something to do with the yellow paper in their books.

(　　)

(3) The result of the experts' research is found in the teachers' eyes.

(　　)

(4) From the passage we can know that the backward of white paper is heavier than that of yellow.

(　　)

(5) The textbooks and exercise - books made of yellow paper have been used all over Shanghai.

(　　)

　 Eye doctors in Shanghai found out that the nearsightedness among primary and middle school students has something to do with the colour of the paper in their textbooks and notebooks．

　 The doctors suggested that yellow paper will be used to replace the white one．According to

their research，the experts found out white paper reflects too much light and easily tires a person’s eyes．The yellow paper，however，doesn’t look so sharp to a person’s eyes．In other words，it is much milder to the eyes of students who may do reading or writing for hours．

The experts’research findings were based on first．hand information and a number of scientific experiments including a new study among the students from forty-one middle schools．To make the students understand the truth，Shanghai Education Development Co．Ltd．has produced textbooks and exercise．books made of yellow paper．The books will be used in the whole city soon．

(　 )49．What does the word“replace”here mean in Chinese?

　　　 A．放置　　　　 　B．重置　　　　 C．替代　　　　 D．发生

(　 )50．The doctors found out_________ caused the students’nearsightedness．

　　　 A．their studies have　　　　　　　　 B．the colour of the paper has

　　　 C．the textbooks and notebooks have　　 D．the colour of their clothes has

(　 )51．Why does white paper easily make our eyes tired?

　　　 A．Because white paper reflects too much light．

　　　 B．Because white paper gets in too much light．

　　　 C．Because white paper is always shining．

D．Because white paper is too bright．

　

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