单选题：The use of blue lights to reduce suicides __．

题目内容：

The use of blue lights to reduce suicides __． A．has no result yet
B．is proved effective
C．is welcomed by suicides
D．has been refused by stations

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

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What is the writer's attitude toward Shot Spooters?A．Be indifferent to it． B．Be

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