Who would choose Beta? Very few Beta's, but mostly Alpha's. Alpha, I think, is the right answer here but why?

好,谁会选β,很少有选β的,基本都选的是α,α应该是正确答案

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On the other hand, when it came to penetrating solids, penetrating solids, the alpha radiation was poor at penetrating solids, whereas the beta radiation was very good at penetrating solids.

另一方面，当研究穿过固体的时候，嗯，穿过固体，会发现阿尔法射线很难穿过固体，然而贝塔射线,很容易穿过固体。

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