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问题:

The foremost reason why the egg-based method is defective lies in_____. [A]thecomp

The foremost reason why the egg-based method is defective lies in_____.

[A] the complex process of vaccine production

[B] its potential threat to human being

[C] the low survival rate for new flu vaccines

[D] its contribution to the flu vaccine shortage


  参考答案

正确答案:C

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