Positing an enormous volcanic explosion at the end of the Permian period would explain the presence of a buried crater, account for the presence of the element iridium (originating deep within the earth), and the presence of quartz having been shattered by high-impact shock waves.


account for the presence of the element iridium (originating deep within the earth), and the presence of quartz having been

of the element iridium (originating deep within the earth), and of quartz

the element iridium (originating deep within the earth), and explain the presence of quartz having been

the presence of the element iridium (originating deep within the earth), and explain presence of quartz

explain the element iridium (originating deep within the earth), and the presence of quartz

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考题讲解

题目分析：
本题看似难词比较多，但实际上考查了非常简单的平行。本题的大概意思为：定位一个爆炸可以解释一些现象的出现，这些现象包括“埋在地下的陨石坑”，“铱元素（the element iridium）”，和“石英（quartz）”。因此，此三者需要在语法上保持平行。只有选项(B)保证了语法的平行，答案为(B)。

选项分析：

略。

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