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He has invented a safety ________ which can give warning when gas is leaking．


  1. A.
    device
  2. B.
    trap
  3. C.
    equipment
  4. D.
    tool
A
device表示“裝置”，B項trap表示“陷阱”，C項equipment表示“設備”，而D項的tool表示“工具”，這句句子的意思是“他發(fā)明了一種安全裝置，在煤氣泄漏前發(fā)出警告。”
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