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

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

admin2010-01-16  30
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 【31】______ for the first time in February 2003 in Hanoi, 【32】______ since then has infected more than 1,600 people in 15 countries, killing 63. At this 【33】______ , there are more questions than answers surrounding the disease. Symptoms start 【34】______ a fever over 100.4 degrees F, chills, headache or body 【35】______. Within a week, the patient has a dry cough, which might 【36】______ to shortness of breath. In 10% to 20% of cases, patients require 【37】______ ventilation to breathe. About 3.5% die from the disease. Symptoms 【38】______ begin in two to seven days, but some reports suggest it 【39】______ take as long as 10 days. Scientists are close to 【40】______ a lab test to diagnose SARS. In the meantime, it is diagnosed by its symptoms. There is no evidence 【41】______ antibiotics or anti-viral medicines help, 【42】______ doctors can offer only supportive care. Patients with SARS are kept in isolation to reduce the risk of 【43】______ . Scientists aren’t sure yet, but some researchers think it’s a 【44】______ discovered corona virus, the family of viruses that cause some common colds. Most cases appear to have been passed 【45】______ droplets expelled when infected patients cough or sneeze. Family members of infected people and medical workers who care 【46】______ them have been most likely to 【47】______ the illness. But recent developments in Hong Kong suggest that the 【48】______ might spread through air, or that the virus might 【49】______ for two to three hours on doorknobs or other 【50】______ . Health experts say it is unlikely, though, that sharing an elevator briefly with an infected person would be enough to pass the virus.
选项 A、but
B、and
C、or
D、yet
答案B
解析 语义线索。and为并列连词，表顺承；but为并列连词，表转折；or为并列连词，表选择，或、否则；yet为副词或连词，表转折。该句意应该是顺承，发现的时间之后接着是目前的状况。
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