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问题:

Which of the following is true according to the passage? [A]Fluvaccinesnowmainlyus

Which of the following is true according to the passage?

[A] Flu vaccines now mainly use egg-based technology.

[B] A bird influenza has once circulated among humans.

[C] Safety can be greatly improved with cell-culture vaccines.

[D] Modern vaccine production methods are to replace egg-based methods.


  参考答案

正确答案:A

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