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What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
。关于这个话题，WPS官方版本下载提供了深入分析
Фонбет Чемпионат КХЛ。业内人士推荐safew官方版本下载作为进阶阅读
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