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Passage 1

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单项选择题
What does the example of the Smallpox Vaccine illustrate
A.The passible negative outcome of administering vaccines.
B.The practical use of a vaccine to control an epidemic disease.
C.The effectiveness of vaccines in eradicating certain disease.
D.The method by which vaccines are employed against the disease.
单项选择题
The moral shortsightedness is revealed in the fact that ___________ .
A.the government has stopped the experiment on human tissue
B.the donation consent forms are difficult to understand
C.the Human Tissues Act is an obstacle to important medical research
D.embryonic research shows disregard for human life
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