正确答案：
错
解析：
特定信息的找寻和理解。题干中提到的seismic activity(地震活动)为关键信息。从录音中提到的“…there are increases and decreases in episodes of seismic activity, but there is no regular or predictable pattern”，可知虽然地震活动周期有起有伏，但没有什么规律可循，也无法预测其态势。而题干中却指出“地震活动周期变得越来越复杂，可能会导致地球的颤动”，与录音中相关内容不符。
【录音原文】
Our discussion of earthquakes would be incomplete if we didn’t raise the possibility of their being caused by external forces. As you know there are increases and decreases in episodes of seismic activity, but there is no regular or predictable pattern.
