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  3. The best title for the text may be What does the example of the Smallpox Vaccine illustrate?

The best title for the text may be What does the example of the Smallpox Vaccine illustrate?

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问题 The best title for the text may be
What does the example of the Smallpox Vaccine illustrate?
选项 A、A possible negative outcome of administering vaccines.
B、The practical use of a vaccine to control an epidemic disease.
C、A method by which vaccines are employed against the disease.
D、The effectiveness of vaccines in curing certain disease.
答案A
解析
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考研英语一

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