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  3. The World Health Organization is using a new combination of drugs to treat African trypanosomiasis disease, also known as sleepi

The World Health Organization is using a new combination of drugs to treat African trypanosomiasis disease, also known as sleepi

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问题     The World Health Organization is using a new combination of drugs to treat African trypanosomiasis disease, also known as sleeping sickness. The drugs will be given out in Uganda and the Democratic Republic of the Congo.
    Officials say the new treatment has fewer side effects. It is also more effective and less costly than the drugs traditionally used. In addition, the new treatment reduces the number of injections needed. And it shortens the amount of time patients must spend in hospital.
    Sleeping sickness threatens millions of people in 36 countries in Africa. Most live in poor rural areas. The disease is caused by the trypanosoma parasite(寄生物). It is spread to humans through the bite of infected tsetse flies(采采蝇). Common signs of sleeping sickness include fever, headaches, extreme tiredness and pain in the muscles and joints. Early identification of the disease may be difficult because many infected people do not show any immediate symptoms. Over time, the parasites invade the central nervous system. The disease causes sleep disorders, mental confusion, personality changes and speech problems. If left untreated, sleeping sickness kills.
    It’s estimated that about 60,000 people are currently infected with the disease. It develops in two different forms. Trypanosomagambiense is responsible for 90% of the reported cases of sleeping sickness. People infected with this form may develop the disease over many years without any major symptoms. Until now the drug melarsoprol is used to treat patients in the advanced stage of sleeping sickness. But the drug requires many painful injections several times a day for several weeks. It also causes bad side effects, some of which can be deadly.
    In Uganda, a new study has confirmed earlier research linking the spread of sleeping sickness to infected farm animals. The writers of the study have called for stronger rules requiring cattle to be treated before being sold at market.
It can be inferred from the last paragraph that ______.
选项 A、farm animals infected by trypanosoma parasite is a main source of sleeping sickness
B、all the animals must be get rid of by the government
C、there isn’t any rules requiring cattle to be treated before being sold at market in Uganda
D、cattle is forbidden to enter the market before being infected by trypanosoma parasite
答案A
解析 本题为深层推理题，提问的是从文章中可以了解到什么。根据最后一段“In Uganda，a newstudy has confirmed earlier research linking the spread of sleeping sickness to infectedfarm animals”可知A)项正确。文中没有提及B)项。根据最后一句“The writers of thestudy have called for stronger rules requiring cattle to be treated before being sold at market”可知，以前就有这样的制度，但不严格，故C)项错误。D)项为理解错误而得出的结论，故排除。所以答案为A)。
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