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  3. Which of the following is the most appropriate title for the passage? Which of the following is NOT mentioned as a factor contr

Which of the following is the most appropriate title for the passage? Which of the following is NOT mentioned as a factor contr

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问题 Which of the following is the most appropriate title for the passage?
Which of the following is NOT mentioned as a factor contributing to the extent to which a virus spreads?
选项 A、The effect of the virus to human beings.
B、The strength of the opposition the virus encounters.
C、The ease with which the virus can be transmitted.
D、The immunity the virus can induce.
答案D
解析 通读全文我们可以看到只有答案选项在文章中没有提到。文章没有提到病毒可以引起免疫功能的问题。
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