There is supposed to be a safety ______ which makes it impossible for trains to

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问题 There is supposed to be a safety ______ which makes it impossible for trains to collide.

选项 A、appliance
B、accessory
C、machine
D、mechanism

答案 D

解析近形近义题。句意：应该有一种使火车不可能相撞的安全装置。本题涉及名词语义上下文理解搭配及语义相关干扰。Aappliance“器具”；B accessory“附件”；Cmachine“机器”；D mechanism装置，如the brake～刹车装置。根据词义和句意，选D 。

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