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单选题
_____
A

precautions

B

protections

C

provisions

D

preventions


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参考解析
解析:
词义辨析题。safety precaution安全预防措施。protection保护。provision规定,供应。prevention预防;妨碍。句意:许多工厂都用颜色作为安全预防措施。
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