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  3. The outbreak of swine flu that was first detected in Mexico was declared a global epidemic on June 11,2009．It is the first world

The outbreak of swine flu that was first detected in Mexico was declared a global epidemic on June 11,2009．It is the first world

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问题    The outbreak of swine flu that was first detected in Mexico was declared a global epidemic on June 11,2009．It is the first worldwide epidemic【1】by the World Health Organization in 41 years.  
   The heightened alert【2】an emergency meeting with flu experts in Geneva that assembled after a sharp rise in cases in Australia, and rising【3】in Britain, Japan, Chile and elsewhere.  
   But the epidemic is "【4】" in severity, according to Margaret Chan, the organization’s director general,【5】the overwhelming majority of patients experiencing only mild symptoms and a full recovery, often in the【6】of any medical treatment.  
   The outbreak came to global【7】in late April 2009, when Mexican authorities noted an unusually large number of hospitalizations and deaths【8】healthy adults. As much of Mexico City shut down at the height of a panic, cases began to【9】in New York City, the southwestern United States and around the world.  
   In the United States, new cases seemed to fade【10】warmer weather arrived. But in late September 2009, officials reported there was【11】flu activity in almost every state and that virtually all the【12】tested are the new swine flu, also known as (A) H1N1, not seasonal flu. In the U. S. , it has【13】more than one million people, and caused more than 600 deaths and more than 6,000 hospitalizations.  
   Federal health officials【14】Tamiflu for children from the national stockpile and began【15】orders from the states for the new swine flu vaccine. The new vaccine, which is different from the annual flu vaccine, is【16】ahead of expectations. More than three million doses were to be made available in early October 2009, though most of those【17】dose were of the FluMist nasal spray type, which is not【18】for pregnant women, people over 50 or those with breathing difficulties, heart disease or several other【19】. But it was still possible to vaccinate people in other high-risk groups: health care workers, people【20】infants and healthy young people.
选项 A、as
B、if
C、unless
D、until
答案A
解析 随着天气转暖，美国的病例数逐步减少。as：随着。   
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