2. 考研
  3. How do vaccines protect humans from diseases according to paragraph 2? The main purpose of the text is to______.

How do vaccines protect humans from diseases according to paragraph 2? The main purpose of the text is to______.

admin2009-04-27  58
问题 How do vaccines protect humans from diseases according to paragraph 2?
The main purpose of the text is to______.
选项 A、convince the reader that vaccines are not as safe as many think
B、educate the reader on how vaccines are used and some of their dangers
C、educate the reader on the circumstances that would neccesitate widespread vaccinations
D、present the method by which vaccines are used through the case of the smallpox vaccine
答案B
解析 文章主旨。由上题的分析可知，本文的主要目的是认识接种疫苗的用途及危险。因此，选项B正确。其他选项都是文中提到的细节，部分正确。
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考研英语一

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