He said the research, published in the journal Nature, represented "significant progress" in the development of a full blown drug against the disease.

　　The World Health Organization said there are between 50,000 and 70,000 cases of the disease a year, with a further 60 million people at risk of infection.

　　The research in Dundee was backed by partners at the University of York in England and the Structural Genomics Consortium in Toronto, Canada. The two drugs currently available to treat sleeping sickness both have problems. One is with side effects that kill one in 20 patients and the other is costly, only partially effective and requires long-time hospital treatment, the scientists said.

　　17. The word backed in the last paragraph probably means_____.

　　A. conducted

　　B. supported

　　C. believed

　　D. managed

　　18. What the World Health Organization said suggested that______.

　　A. about 60000 people died of the disease each year

　　B. about 60000 people were cured of the disease each year

　　C. 600 million people are likely to get infected

　　D. the disease is spreading fast in Africa

　　19. We can read this passage______.

　　A. in the journal Nature

　　B. in a newspaper of the University of Dundee

　　C. in a book about flies

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