When the limestone or other carbonate rock just below the ground surface dissolv

游客2023-10-15 36

问题 When the limestone or other carbonate rock just below the ground surface dissolves naturally, ______collapses and forms sinkholes.

选项 A、a land
B、the land
C、the lands
D、lands

答案 B

解析句意：当在地表面的石灰岩和其他的碳酸岩自然风化后，大地便会倒塌，形成灰岩坑。后空格后的collapses可知，此处的名词需为单数形式，又由于此处特指大地，故需用定冠词the。故选项B正确。

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