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

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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 A. appliance器具,电器,(独立而能单独使用的)小装置;B.accessory附件,配件,零件;C.machine机器;D.mechanism(复杂的、作为大机器上一部分的)机械装置。从以上辨析可见,D是正确答案。句意为:应该有一种安全装置使火车不能相撞。
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