2. 外语
  3. A. Scientists do not know exactly why Hepatitis develops. B. Hepatitis A often breaks out in filthy places where food and wa

A. Scientists do not know exactly why Hepatitis develops. B. Hepatitis A often breaks out in filthy places where food and wa

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问题 A. Scientists do not know exactly why Hepatitis develops.   
B. Hepatitis A often breaks out in filthy places where food and water are easily contaminated.   
C. Symptoms of hepatitis include languor, loss of appetite, distress of the stomach, and yellowness of urine.   
D. Hepatitis B is the best-known form of viral hepatitis.     
E. The chronic hepatitis lasts a long time and is most likely to recur.   
F. People should pay attention to public environment for the preservation of health.  
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选项
答案B
解析 第四段的段意为“甲肝的爆发通常是由于不卫生的环境，如食或水源的污染造成的。”
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