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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 was the first wo

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

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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 was the first worldwide epidemic【1】by the World Health Organization in 41 years.
    The heightened alert【2】an emergency meeting with flue 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 flue vaccine. The new vaccine, which is different from the annual flu vaccine, is【16】ahead of expectation. More than three million doses were to be made available in early October 2009, though most of those【17】doses were of the FluMist nasal spray type, which is not【18】for pregnant women, people of 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.
【10】
选项 A、as
B、if
C、unless
D、until
答案A
解析 从句引导词题。空格中所需的选项引导状语从句，从句的大意为：温暖天气到来，主句大意为：新病例会逐步减少。由此我们可以推断空格中引导的状语从句是主句的条件，或者时间，或者原因状语从句。A项as可以引导时间状语从句，表“随着……”之意，也可以引导原因状语从句，表“因为……”，这两种理解都符合题意，为本题答案。
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