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Which of the following is the most appropriate title for the passage? What does the author say about the influenza B virus?
Which of the following is the most appropriate title for the passage? What does the author say about the influenza B virus?
admin
2009-06-24
71
问题
Which of the following is the most appropriate title for the passage?
What does the author say about the influenza B virus?
选项
A、B virus is relatively stable and causes mild infections that do not spread far through the population.
B、B virus is unstable, and is responsible for the epidemics that cause frequent concern.
C、B virus is extremely unstable and is responsible for some of the worst outbreaks of the disease.
D、B virus has a very developed variability, and it affects only human beings.
答案
B
解析
文章第二段讲到:"An influenza B virus may cause a widespread epidemic but will have little effect if introduced into the same community soon afterwards,since nearly everyone will have built up antibodies and will be immune".在前面还讲到"The A and B types are unstable,and are responsible for the epidemics that cause frequent concern".由此我们可以看出正确选项。
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