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、阅读理解（本大题共5小题，共0分） A y must be able to prove that they have had a recent vaccination. In this way the disease has been prevented from spreading and today one seldom hears of it at all. This is mainly because of the great discovery made by a village doctor, Edward Jenner, in about 1798 when he published his report of his new experiment called vaccination (from the word 'vacca' meaning a cow). Jenner discovered that people who worked with cattle often suffered from a harmless disease which they caught from the cattle, but these people never seemed to get smallpox. So he experimented by putting the disease into a small opening on the arms of healthy people, and though their arms became painful for a day or two, they soon recovered and none of these people ever got smallpox. So the news of the wonderful discovery spread to other countries and people rushed to their doctors to be vaccinated. In many countries the simple way to deal with the arm was done on thousands of people, and the terrible smallpox began to disappear. 1. Vaccination against smallpox has been so successful that______. A. the discoverer made a large amount of money B. Dr Jenner was given a prize by the World Health Organization C. smallpox has almost disappeared in most countries D. smallpox was no longer in existence on earth | 
