2. 外语
  3. A infected body fluids B against the outbreak severity C the mode of transmission D the initial days of being infected E three c

A infected body fluids B against the outbreak severity C the mode of transmission D the initial days of being infected E three c

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问题 A infected body fluids
B against the outbreak severity
C the mode of transmission
D the initial days of being infected
E three countries in West Africa
F within a wide range of days
The symptoms of the patients after being infected may first appear______.
选项
答案F
解析 由第四段第二句“Symptoms may appear as early as two days or as late as three weeksafter initial infection”可知，感染埃博拉的症状可能最早在感染后两天或晚至三周才会显现，说明潜伏的天数不等，故本题应选F。
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