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    　 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．

    　

    　 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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