30. It took a great number of medical r rs to develop effective vaccine for H1N1.

問題詳情

30. It took a great number of medical r rs to develop effective vaccine for H1N1.

參考答案

答案：[無官方正解]
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

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