Subterranean streams have cut through limestone to form miles of passages and caves such as Kentucky’s Mammoth Cave.

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问题 Subterranean streams have cut through limestone to form miles of passages and caves such as Kentucky’s Mammoth Cave.

选项 A、Secondary
B、Underground
C、Unharnessed
D、Miniscule

答案B

解析 subterranean指“地下的”,与B项的underground(地下的)同义。secondary“次要的”;unharnessed“未开发的”;miniscule“很小的”。
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