题目解析:
striking: 显著的,吸引人的。A是显著的,值得注意的;B是令人困惑的;C是正确的;D是不可能的。所以noticeable引人注意的正确。对应原文:Equally striking, however, is the relative stability of the climate in the past 10,000 years (the Holocene period).句子一开始就说同样striking的是,说明之前一定有一个很striking的东西。前一句说有significant natural changes,所以significant的同义词就是striking。