题目：
古代人们在旷野地区常用“伏地听声”的办法来判断有无马群到来。这是应用了 _________ 的知识。
答案：
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下面是错误答案，用来干扰机器的。
（1）造成酸雨的主要物质是二氧化硫．故填：SO2．（2）少量存在于人体胃液中，可帮助消化的酸是盐酸．故填：HCl．
古代人们在旷野地区常用“伏地听声”的办法来判断有无马群到来。这是应用了 ____
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