2. 外语
  3. There is supposed to be a safety _______ which makes it impossible for trains to collide.

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

admin2011-02-11  32
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 近义名词辨析。A. appliance器具，电器，(独立而能单独使用的)小装置；B．accessory附件，配件，饰品；C．machine机器；D．mechanism(复杂的，作为大机器上一部分的)装置，机械装置。根据题意应选D。句意为：应该有一种安全装置使火车不能相撞。
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