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  3. Weak eyesight is a term that is generally used to refer to near-sighted eyes. People who are near-sighted can see good at

Weak eyesight is a term that is generally used to refer to near-sighted eyes. People who are near-sighted can see good at

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问题     Weak eyesight is a term that is generally used to refer
to near-sighted eyes. People who are near-sighted can see good at         【M1】__________.
a short range, but nothing very far away is likely to be a dull           【M2】__________.
blur.
    The term weak eyesight is misled, for in near-sighted eyes            【M3】__________.
the lenses of the eyes are actually too strong The near-sighted lens
are so powerful that it focuses the light coming into the eye too         【M4】__________.
quick. The image is formed in front of the retina, which contains         【M5】__________.
the optical nerves, Near-sightedness is common, but its growth may        【M6】__________.
be gradual. Often the blurring of distant objects is so slight at first
that a person may recognize the condition. Near-sightedness is            【M7】__________.
frequently discovered first at school. It is here that a student first
realizes, the difficulty of see work on the blackboard, whereas           【M8】__________.
another in the class have no trouble reading the board at all.            【M9】__________.
After discovery, near-sightedness can easily be corrected. A concave
lens called a "minus" lens because it increases the power of the          【M10】__________.
lens of the eye itself is the prescription.
【M6】
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答案but改成and
解析 结合句意可知，前后两句应为并列关系，并无转折含义，故应使用并列连词and。
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