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        More people die of tuberculosis (结核病) than of any

        other disease caused by a single agent. This has probably

        been the case in quite a while. During the early stages of S1. ________

        the industrial revolution, perhaps one in every seventh S2. ________

        deaths in Europe's crowded cities were caused by the S3. ________

        disease. From now on, though, western eyes, missing the S4. ________

        global picture, saw the trouble going into decline. With

        occasional breaks for war, the rates of death and

        infection in the Europe and America dropped steadily S5. ________

        through the 19th and 20th centuries. In the 1950s, the

        introduction of antibiotics (抗菌素) strengthened the

        trend in rich countries, and the antibiotics were allowed

        to be imported to poor countries. Medical researchers S6. ________

        declared victory and withdrew.

        They are wrong. In the mid-1980s the frequency of S7. ________

        infections and deaths started to pick up again around the

        world. Where tuberculosis vanished, it came back; in S8. ________

        many places where it had never been away, it grew better. S9. ________

        The World Health Organization estimates that 1.7

        billion people (a third of the earth's population) suffer

        from tuberculosis. Even when the infection rate was

        falling, population growth kept the number of clinical

        cases more or less constantly at 8 million a year. Around S10. ________

        3 million of those people died, nearly all of them in poor countries.

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