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单项选择题
The best title for the text may be ____________ .
A．"Vaccinations: A Blessing or A Curse"
B．"Principles of Vaccinations"
C．"Vaccines: Methods and Implications"
D．"A Miracle Cure under Attack"
单项选择题
What has caused the chronic organ shortage
A．a decrease in donation rates
B．inefficient governmental policy
C．illegal trade in human organs
D．news media’s indifference
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