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 71. __________ the industrial revolution, perhaps one in every seventh 72. __________ deaths in Europe's were caused by the 73. __________ disease. From now on, though, western eyes, missing the 74. __________ 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 75. __________ 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 76. __________ declared victory and withdrew. They are wrong. In the mid-1980s the frequency of 77. __________ infections and deaths started to pick up again around the world. Where tuberculosis vanished, it came back; in 78. __________ many places where it had never been away, it grew better. 79. __________ 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 80. __________ 3 million of those people died, nearly all of them in poor countries.
were caused by the 73. __________
