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

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

A.appliance

B.accessory

C.machine

D.mechanism

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  • 正确答案: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 。