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Scientists around the world are racing to learn how to rapidly diagnose, treat and stop the spread of a new, deadly disease. SAR

admin2012-06-02  50
问题     Scientists around the world are racing to learn how to rapidly diagnose, treat and stop the spread of a new, deadly disease. SARS — Severe Acute Respiratory Syndrome — was【C1】______for the first time in February 2003 in Hanoi, 【C2】______since then has infected more than 1, 600 people in 15 countries, killing 63. At this【C3】______there are more questions than answers surrounding the disease.
    Symptoms start【C4】______a fever over 100. 4 degrees F, chills, headache or body【C5】______Within a week, the patient has a dry cough, which might【C6】______to shortness of breath. In 10% to 20% of cases, patients require【C7】______ventilation to breathe. About 3.5% die from the disease. Symptoms【C8】______begin in two to seven days, but some reports suggest it【C9】______take as long as 10 days. Scientists are close to【C10】______a lab test to diagnose SARS. In the meantime, it is diagnosed by its symptoms. There is no evidence【C11】______antibiotics or anti-viral medicines help, 【C12】______doctors can offer only supportive care. Patients with SARS are kept in isolation to reduce the risk of【C13】______Scientists aren’t sure yet, but some researchers think it’s a【C14】______discovered corona-virus, the family of viruses that cause some common colds.
    Most cases appear to have been passed【C15】______droplets expelled when infected patients cough or sneeze. Family members of infected people and medical workers who care for them have been most likely to【C16】______the illness. But recent developments in Hong Kong suggest that the【C17】______might spread through air, or that the virus might【C18】______for two to three hours on doorknobs or other【C19】______Health experts say it is【C20】______, though, that sharing an elevator briefly with an infected person would be enough to pass the virus.
【C12】
选项 A、so
B、but
C、still
D、yet
答案A
解析 逻辑衔接题。由前文的no evidence…help和后面的only可知，前后之间是因果关系。因为药物不能起到帮助作用，所以医生只能提供一些护理。表示因果关系的词只有[A]so.
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