2. 外语
  3. The improbable chain of events that leads Alexander Fleming 1. ______ to discover penicillin in 1928 is the stuff which s

The improbable chain of events that leads Alexander Fleming 1. ______ to discover penicillin in 1928 is the stuff which s

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问题     The improbable chain of events that leads Alexander Fleming    1. ______
    to discover penicillin in 1928 is the stuff which scientific myths    2. ______
    are made. It was a discovery that would change the course of the history. The active ingredient in that mold,  which Fleming
    named penicillin,  turned to be an infection-fighting agent of    3. ______
    enormous potency. When it was finally recognized as what it
    was--the efficacious life-saving drug in the world--penicillin    4. ______
    would alter forever the treatment of bacterial infections. By the
    middle of the century, Fleming’s discovery spawned a huge phar-    5. ______
    maceutical industry, churning out synthetic penicillin that would
    conquer some of man-kind’s most ancient scourges,  including
    syphilis, gangrene, and tuberculosis.
    When he died a heart attack in 1955, he was mourned by    6. ______
    the world and buried as a national hero in the crypt of St. Paul’s
    Cathedral in London. Although Fleming’s scientific work in and
    of itself may not have reached great, his singular contribution    7. ______
    changed the practice of medicine. He deserves our utmost recog-
    nition. At the same time,  we must bear on mind that the    8. ______
    "Fleming Myth", as he called it, embodies the accomplishments
    of many giants of anti-biotic development. Fleming is but a cho-
    sen representative for the likes of Florey, Chain, Domagk, and
    Waksman, many of who remain, sadly, virtual  unknowns. 9. ______
    Their achievements have made the world a better,  healthier
    place. In commemorating Fleming,  and we commemorate them    10. ______
    all.
    How does it happen that children learn their mother tongue
    so well?  When  we  compare  with  adults  learning  a  foreign    11. ______
    language, we often find this interesting fact. A little child
    without knowledge or experience often succeeds to a complete    12. ______
    master of the language. A grown-up person with fully developed    13. ______
    mental powers, in most cases, may end up in a faulty and inex-    14. ______
    act command. What accounts of this difference?    15. ______
    Despite other explanations,  the real answer in my opinion
    lies partly with the child himself, partly in the behavior of the    16. ______
    people surround him. In the first place, the time of learning the    17. ______
    mother tongue is the most favorably of all,  namely,  the first    18. ______
    years of life. A child hears it speak from morning till night and,    19. ______
    what is more important,  always in its genuine form, with the
    right pronunciation, right intonation, right use of words and right
    structure. He drinks all the words and expressions which come to    20. ______
    him in a fresh，ever-bubbling spring．There is no resistance：
    there is perfect assimilation．
选项
答案∧spawned改错had。
解析 前面的时间状语用by引导，主句一般用完成时。
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