A、about a kilometre each B、separated from each other C、rooms built of limestone D、what interest visitors most C由文章第四段“These cave

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问题

选项 A、about a kilometre each
B、separated from each other
C、rooms built of limestone
D、what interest visitors most

答案C

解析 由文章第四段“These caves are a group of large underground rooms made of limestone”一句可以看出。故正确的答案为C。
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