Look at the mind map on the right carefully. Of the words below, which one is suitable in the blank?...
2022-05-03 10:19:01 43次 2020年江苏省南京市建邺区中考一模英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
Look at the mind map on the right carefully. Of the words below, which one is suitable in the blank?
A.air B.caves C.trees D.water
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