2. 外语
  3. Rabies is all ordinarily infectious disease of the central nervous system. It is caused by a virus and,【C1】______a rule, spread

Rabies is all ordinarily infectious disease of the central nervous system. It is caused by a virus and,【C1】______a rule, spread

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问题     Rabies is all ordinarily infectious disease of the central nervous system. It is caused by a virus and,【C1】______a rule, spread chiefly by domestic dogs and【C2】______flesh-eating animals. Man and all Warm-blooded animals are susceptible【C3】______rabies. The people of【C4】______Egypt, Greece and Rome ascribed rabies to evil spirits【C5】______ordinarily gentle and friendly animals suddenly became vivacious and violent【C6】______evident Cause and,【C7】______a period o t maniacal behavior became Paralyzed and died.
    Experiments【C8】______out in Europe in the early nineteenth century of injecting saliva from a rabid dog【C9】______a normal dog proved that the disease was infectious. Preventive steps,【C10】______as the destruction of stray dogs, were taken and【C11】______1862 the disease was permanently eliminated in Norway, Sweden and Denmark. Though urban center on the continent of Europe were cleared several times daring the nineteenth century,【C12】______soon became re-infected since rabies was uncontrolled among wild animals.
    Anti-rabies vaccine is widely used nowadays in two ways. Dogs may be give three-year protection【C13】______the disease by one powerful injection【C14】______persons who have been【C15】______by rabid animals are given a course of daily injections over a week【C16】______ten days. The mortality rate from all【C17】______of bites from rabid animals has dropped from 9% to 0.5%. In rare【C18】______, the vaccine will not prevent rabies in human【C19】______because the virus produces the disease before the person’s body has【C20】______to build up enough resistance. Because of this , immediate vaccination is essential for anyone bitten by an animal observed acting strangely and the animal should be captured circumspectly, and examined professionally or destroyed.
【C12】
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答案they
解析 该处缺少主语，根据前文知，主语是“urban center on the continent of Europe”，这里应用代词“they”。
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