单选题 The toy boat turned over and sank to the bottom of the pool.
  • A. basis
  • B. ground
  • C. base
  • D. basement


【正确答案】 C
【答案解析】C．bottom“底”；base“底部”；basis“基础”；ground“地面”；basement“地下室”。句意：玩具船翻了，沉到了池底。