2. 外语
  3. In ancient times, some catastrophic extinction of species occurred______.

In ancient times, some catastrophic extinction of species occurred______.

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问题 In ancient times, some catastrophic extinction of species occurred______.
选项 A、sequentially
B、repeatedly
C、naturally
D、intentionally
答案C
解析 C选项naturally的意思是“自然地”；A选项sequentially的意思是“相继地，连续地”；B选项repeatedly的意思是“反复地”；D选项intentionally的意思是“故意地”。本题意为“在古代，一些灾难性的物种灭绝自然地发生”。
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