For well over a thousand years, smallpox was a disease that everyone feared. The disease killed much of the native population in South America when the Spanish arrived there in the early sixteenth century. By the end of the eighteenth century, smallpox was responsible for about one in ten deaths around the world. Those who survived the disease were left with ugly scars on their skin.
It had long been well known among farmers that people who worked with cows seldom caught smallpox; instead, they often caught a similar but much milder disease called cowpox (牛痘) . A British doctor called Jenner was extremely interested in this, and so he studied cowpox. He believed that, by vaccinating (给接种疫苗) people with the disease, he could protect them against the much worse disease smallpox. In 1796, he vaccinated a boy with cowpox and, two months later, with smallpox. The boy did not get smallpox. In the next two years, Jenner vaccinated several children in the same way, and none of them got the disease.
News of the success of Jenner’s work soon spread. Vaccination soon became a common method to protect people against other diseases caused by virus, such as rabies (狂犬病), and vaccines were sent across the world to the United States and India.
It took nearly two centuries to achieve Jenner’s dream of getting free of smallpox from the whole world. In 1967, the world Health Organization (WHO) started a great vaccination program, and the last known case of smallpox was recorded in Somalia in 1977. The story of vaccinations does not end there, however. There are many other diseases that kill more and more people every year. Besides, many new diseases are being discovered. The challenge for medical researchers will, therefore, probably continue for several more centuries
【小题1】Smallpox was so serious that _________________ by the end of l8th century
A.its death rate was up to ten percent |
B.those who caught it were certain to die |
C.one in ten people in the world died of smallpox |
D.one in ten deaths in the world was caused by smallpox |
A.make smallpox much milder |
B.stop people from getting smallpox |
C.protect people against any disease |
D.prevent people’s scars after smallpox |
A.The first experiment with cowpox was made by a British doctor. |
B.After 1977 smallpox disappeared around the world according to WHO. |
C.Vaccination had existed among ordinary farmers before being discovered. |
D.Vaccination can be used to protect people in the world against not only smallpox. |
A.vaccinations bring many new problems |
B.vaccinations end the spread of diseases |
C.there is a long way to go to fight against diseases |
D.there is a long way to go to discover new diseases |
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Mary was seven years old. Her parents recently moved to a new town, and so Mary was going to a 36 school, which was a few kilometers from the house they lived in now. A school bus going around picked up 37 every morning and brought them back to their 38 every afternoon, and as both of Mary’s parents 39 to go to work, she always went on this bus.
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Mary was seven years old. Her parents recently moved to a new town, and so Mary was going to a 36 school, which was a few kilometers from the house they lived in now. A school bus going around picked up 37 every morning and brought them back to their 38 every afternoon, and as both of Mary’s parents 39 to go to work, she always went on this bus.
Mary’s parents always 40 their alarm clock for seven o’clock so that none of them would be 41 . But one morning the alarm 42 to go off, and it was not until a quarter past eight that Mary’s mother suddenly 43 , looked at the clock and said, “What’s ever happened to that clock?” and then 44 into Mary’s room to wake her up.
“I’m sorry, dear,” she said, “ 45 you’ll have to wash and dress very quickly, have an even 46 breakfast and then I’ll 47 you to school on my way to the office.”
“But how can you find the 48, Mum?” Mary said, “You’ve been to school only once.”
“Yes,” her mother answered, “but you’ve done the 49 several times now on the bus, so you can be my guide to get there, can’t you?”
“Oh, yes,” said Mary, “I suppose so.” She washed, and 50 and had a quick breakfast, and then they set off. Mary told her mother to turn each time they came to a place she 51 .In this way she made her mother drive round most of the town 52 they got to her school. When they arrived, her mother saw that it was not really very far from her house.
“Why ever did you make me go such a long way round, Mary, instead of the most 53 way?” her mother asked her.
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76.__________ 77.__________ 78.__________ 79.__________ 80.__________ 81.__________ 82.__________ 83.__________ 84.__________ 85._________ |
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