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

解析本题意为“在古代，一些灾难性的物种灭绝自然地发生。”naturally的意思是“自然地”；sequentially的意思是“相继地，连续地”；repeatedly的意思是“反复地”；intentionally的意思是“故意地”。四个选项中只有C项符合题意。

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